Climate change: 30-year forecasts and the tipping point

2024 was the warmest year on record, with a global average temperature of + 1,55 ° C compared to the pre-industrial era. The three-year period 2023-2025 was the first in history in which the three-year average exceeded the threshold of + 1,5 ° C. And human-caused warming has already reached + 1,37 ° C.

These aren't abstract numbers from reports: they're the starting point for a question that more and more people are asking. What will happen to the climate in the next 30 years? And have we already passed the point of no return? If so, when will it be?

In this in-depth article, we explain what the most authoritative scientific sources really say: the IPCC, the World Meteorological Organization, Copernicus, and the main studies published in international scientific journals. We use simple language, clear numbers, and infographics you can read conveniently on your phone.

Where We Are Today: Climate Numbers for 2026

Before looking ahead, we need a clear picture of the present. The scientific consensus data, updated to early 2026, says this:

• 2024: warmest year on record, +1,55 °C (with an uncertainty of ±0,13 °C) compared to the 1850-1900 average, according to the World Meteorological Organization (WMO).
• 2025: Third warmest year on record, just 0,01°C below 2023, according to Copernicus. Antarctica recorded its warmest year on record.
• Three-year period 2023-2025: For the first time, the average for three consecutive years has exceeded +1,5°C compared to the pre-industrial era.
• Human-induced warming: +1,37 °C in 2025, increasing at a rate of 0,27 °C per decade, according to the Indicators of Global Climate Change 2025 report.
• Global greenhouse gas emissions: in 2024 they reached the record of 57,7 milliards of tons of CO2 equivalent, up 2,6% from the previous year (UNEP).
• Sea level: rises to 4,77 mm per year in the period 2014-2023, more than double the 2,13 mm/year in 1993-2002.

These numbers are not “opinions”: they are cross-referenced measurements from dozens of independent agencies around the world, from satellites to weather stations.

Here's what the global temperature curve looks like, with projections up to 2050:

Infographic: Observed global temperature from 1850 to 2025 (white line) and projections for 2050 under the three IPCC scenarios. Sources: WMO, Copernicus, IGCC 2025, IPCC AR6.

How climate forecasts are made

To understand forecasts, you need to understand how they work. The weather forecast tells you if it will rain in Naples tomorrow. The climate tells you, over decades, what the "average" weather will be: hotter, drier, more extreme.

Scientists build scenery, not prophecies. The word is important: a scenario is "what would happen if emissions followed a certain path." It's not a bet on what will definitely happen, but a map of possible futures, each with its own probability.

The IPCC, the UN's Intergovernmental Panel on Climate Change, uses five scenarios called SSPs (Shared Socioeconomic Pathways). The three that are useful for understanding our future are:

• SSP1-1.9: The world cuts emissions rapidly and reaches net-zero emissions by 2050. This scenario is compatible with the Paris goal of staying below 1,5°C.
• SSP2-4.5: The intermediate scenario: some climate policies, but the world remains heavily dependent on fossil fuels. This leads to approximately 2,7°C of warming by the end of the century.
• SSP5-8.5: The "business as usual" scenario, with high emissions and growing dependence on coal, leads to approximately 4,4°C by 2100.

The key point is this: the climate of 2050 depends largely on today's decisionsIt's not a written destiny, it's a crossroads with three roads ahead.

Forecasts for the next 30 years: temperature

Let's put the dates on the table now, because this is the part everyone is looking for.

By 2030: exceeding 1,5°C

According to the most up-to-date indicators (Indicators of Global Climate Change 2025), if emissions continue at current rates, global average warming will reach 1,5°C around 2030The most recent estimate speaks of about four years from 2025, therefore between 2029 and 2030.

This is not breaking news: the World Meteorological Organization, in its 2025-2029 update, had already calculated a probability of86 % that at least one year of the five-year period exceeds 1,5 °C, and 70 % that exceeds the average for the entire five-year period. Events like 2024 have made what was once a scenario a reality.

2050: Three Possible Futures

The IPCC projections for the period 2041-2060 (i.e. the mid-century climate average) say this:

• Scenario SSP1-1.9 (rapid cuts): approximately 1,5 ° C, with a range of 1,2-1,8 °C.
• SSP2-4.5 Scenario (Intermediate): Approximately 2,0 ° C, with a range of 1,7-2,4 °C.
• SSP5-8.5 scenario (high emissions): approximately 2,4 ° C, with a range of 2,0-2,9 °C.

By the end of the century the differences become enormous: from 1,4 ° C in the virtuous scenario 4,4 ° C in the worst-case scenario, going through the 2,7°C of the intermediate scenario.

And what are we really doing? The UNEP Emissions Gap Report 2025 is merciless: with the policies currently in place the world is moving towards 2,8 ° C of warming by 2100; even if all national commitments (NDCs) were met to the letter, we would reach 2,3-2,5°C. In other words, current promises will not achieve either 1,5°C or 2°C.

The difference between 1,5°C and 2°C is not a laboratory detail. At 2°C, compared to 1,5°C, extreme heat waves become more frequent and intense, coral reefs almost disappear (over 99% versus 70-90%), and sea levels rise by 10-15 cm. Every tenth of a degree counts, literally.

Extreme events: what to expect by 2050

The thermometer is only half the story. The other half is what the extra heat does to the system: more energy in the atmosphere means more violent and frequent weather events.

Heat waves

This is the most direct and now obvious effect. The IPCC defines the increase in frequency and intensity of extreme heat events across most of the world's landmasses as "practically certain" (over 99% probability). 2025 confirmed this trend in Europe and the Mediterranean, with increasingly longer summers and tropical nights (lows above 20°C) even in Northern Italy. Heat waves in Campania with peaks of 41°C, like those recently seen, are no longer exceptional: in the intermediate scenario, they will become the summer norm by 2050.

Drought and fires

Warming accelerates evaporation: soil dries out faster, dry seasons lengthen, and fires find more fuel. In the Mediterranean, one of the most exposed areas on the planet, the burned area is already growing year after year. Projections indicate more frequent and intense droughts across much of the basin, with direct impacts on agriculture and water supplies.

Heavy rains and floods

Warmer air holds more water vapor: about 7% more for every degree of warming. When it rains, it rains more and more quickly. This is the mechanism behind the flash floods that now regularly hit Italian cities: precipitation concentrated in a few hours on often heavily built-up and fragile terrain. The intermediate scenario projects an increase in extreme storms in autumn, precisely during the seasons when the Mediterranean is warmest.

It's not just a matter of nature: extreme heat also puts infrastructure under stress, as demonstrated by the phenomenon of summer blackouts when the electricity grid is overwhelmed by air conditioning consumption. The changing climate is also being felt in bills and services.

Sea level and coasts

The sea rises for two reasons: warm water expands (thermal expansion) and land ice, from Alpine glaciers to large ice sheets, adds water. Since 1880, the global average level has risen by approximately 25 cm, and the pace continues to accelerate: more than double compared to thirty years ago.

Infographic: Sea level rise from 1880 to today and IPCC projections up to 2100. Source: IPCC AR6, WMO 2024.

The IPCC projections to 2050 are almost the same in all scenarios: +15-23 centimeters Compared to the 1995-2014 period, the reason is simple: the sea responds decades later to the warming that has already occurred. Even if we stopped all emissions tomorrow, sea levels would continue to rise for centuries.

By 2100 the paths will clearly separate: from 28-55 cm in the virtuous scenario 63-101 cm in the high-emission zone. And in the very long term, with 1,5°C of warming, sea levels are projected to rise by 2-3 meters within 2000 years: the ice caps will not retreat.

For Italy, the issue is concrete: 8.000 kilometers of coastline, densely populated coastal plains, cities like Venice, and much of the exposed delta plains. Added to this is subsidence, the natural lowering of the land, which in some areas doubles the effect of sea level rise. The G20 Climate Risk Atlas, coordinated by the CMCC, estimates that without adaptation measures, thousands of square kilometers of Italian coastal areas would be at risk of flooding by the end of the century.

Ecosystems at the edge: corals, Amazon, ice

The climate doesn't just change the thermometer: it shifts the balance of entire ecosystems, some of which have already exceeded, or are about to exceed, their survival threshold.

Coral reefs

They are the most fragile system and closest to the breaking point. The 2018 IPCC Special Report estimated that at +1,5 °C the 70-90% of warm-water corals; at +2°C, over 99%. With current warming at 1,37°C, the window to save them is already very narrow: mass bleaching events, such as those in 2023-2024 on the Great Barrier Reef, are a sign that the threshold is approaching.

The Amazon rainforest

The Amazon itself produces part of the rain that keeps it alive (the so-called "flying rivers"). If the forest degrades, the cycle is broken and the forest can transform into savannah, releasing billions of tons of CO2. The study by Flores and colleagues published in Nature in 2024 estimates that by 2050 Between 10% and 47% of the forest could be exposed to combined stresses (drought, fires, deforestation) capable of triggering unexpected transitions. Deforestation lowers the critical threshold: there's no point waiting for 3-4°C of global warming if humans are cutting down the forest in the meantime.

The great ice caps

Greenland and West Antarctica contain enough ice to raise sea levels by about 1000 feet, respectively. 7 meters e 4 metersTheir complete melting would take centuries, but the trigger point may come sooner than previously thought: a June 2025 study published in Communications Earth & Environment estimated that West Antarctica could initiate irreversible collapse with ocean warming of just 0-0,25°C above current levels. In practice, the threshold may have already been reached, and once the process is triggered, it is virtually impossible to stop.

The Point of No Return: What It Really Is

Now comes the question that gives the title to this article. The "tipping point" is a precise concept: it is the threshold beyond which a system changes state in a rapid and irreversible, like a chair tipping over or a ball rolling off the edge of a hill. As long as you're before the edge, you can go back. After that, you can't.

There are many tipping points in the climate, each with its own threshold and date. Here are the main ones, with the thresholds estimated from the scientific literature:

Infographic: Major tipping points, with temperature thresholds and estimated times. Sources: Armstrong McKay et al. 2022, Global Tipping Points Report 2023, Ditlevsen & Ditlevsen 2023, van Westen et al. 2024, Flores et al. 2024.

The dates that matter

Let's summarize the dates that have emerged from scientific research, distinguishing between what has already happened, what is expected, and what is possible:

• 2024: first calendar year with average temperature above +1,5 °C (WMO).
• 2023-2025: first three-year period with average above +1,5 °C (Copernicus).
• ~2028: exhaustion of the carbon budget compatible with 1,5°C (130 billion tonnes of CO2 by the beginning of 2025, at the current rate of consumption).
• ~2030: achieving average warming of 1,5°C if emissions continue (IGCC 2025).
• By 2050: risk window for the Amazon rainforest (10-47% of the forest exposed to combined stresses).
• 2057 (range 2025-2095): central estimate of the collapse of the Atlantic AMOC current in the business-as-usual scenario (Ditlevsen & Ditlevsen 2023).
• Already reached or imminent: the threshold for the collapse of West Antarctica according to the 2025 study, and the threshold for coral reefs.

Have we already passed the point of no return?

The honest answer, the one scientists give, is: It depends on which system you look atThere is no single global "point of no return" with a single date, like a traffic light that changes. There are many clocks, each with its own dial.

For some systems, such as coral reefs and perhaps West Antarctica, the threshold has been crossed or is just around the corner: the damage we see today (bleaching, accelerated melting) is evidence that the process is already underway. The Global Tipping Points Report 2023, authored by over 200 scientists, argues that with current warming (then about 1,2°C), five major systems could already be in the critical zone.

For the system as a whole, the most cited “date” remains the 2030: the year in which, at the current rate, average warming will consistently exceed 1,5°C. Before that date there is the 2028, when the carbon budget will be exhausted: the CO2 "bill" we can still afford. And 2024 is already here, the year the world first saw the global thermometer cross the symbolic threshold.

But note one detail that changes everything: exceeding 1,5°C isn't like taking a picture over the edge. It's a process: the longer we spend above the threshold, the more systems move toward their tipping points, and the greater the risk of cascades of events triggering one another. The risk grows nonlinearly: Armstrong McKay's report published in Science in 2022 estimates that several tipping points could be triggered already in the 1,5-2°C range, and many more in the 2-3°C range, toward which we are heading with current policies.

Here's how much carbon we have left, in one image:

Infographic: The 1,5°C carbon budget and current consumption rates. Sources: IGCC 2025, UNEP Emissions Gap Report 2025.

The roadmap for the next 30 years

Here, year by year, is what scientific projections indicate for the period 2026-2056. Please note: these are not set-in-stone dates; they are milestones that depend on emissions. The more we cut, the further the deadlines get.

• 2026 (present): Anthropogenic warming of +1,37 °C, 2023-2025 three-year period already above 1,5 °C, global emissions still growing after the 2024 record.
• 2026-2027: high probability (86% according to the WMO) that at least one year in the five-year period 2025-2029 will exceed 1,5 °C, and 80% probability that one year will beat the 2024 record.
• ~2028: exhausting the carbon budget for 1,5°C at the current rate of emissions (130 billion tonnes of CO2).
• 2029-2030: An average exceedance of 1,5°C if emissions continue; a key year for international commitments, which call for cutting emissions by nearly half by 2030 compared to 2019 to stay below the threshold.
• 2030-2035: Extreme heatwaves and increasing droughts in the Mediterranean; growing pressure on coral reefs, which at 1,5°C will lose 70-90% of their surface area.
• ~2040: In the high-emissions scenario, we're moving toward 2,4°C by mid-century; in the intermediate scenario, this is the last window to stay below 2°C.
• 2041-2060 (mid-century average): 1,5 °C in the virtuous scenario, 2,0 °C in the intermediate one, 2,4 °C in the high emissions scenario (IPCC).
• ~2050: Sea level rise of 15-23 cm in all scenarios; risk window for the Amazon (10-47% of exposed forest); “net zero” deadline for the most ambitious countries.
• 2053-2056 (end of 30 years): Current policies are aiming straight for 2,8°C by 2100 (UNEP). Decisions in the 2026-2035 decade will determine which of the three paths becomes reality.

Italy and the Mediterranean: a climate hotspot

Not all areas of the planet are warming at the same rate. The Mediterranean is one of the "hot spots" of global warming: it is warming approximately 20% faster of the planet's average, and the projections for Italy, developed by the CMCC (Euro-Mediterranean Center on Climate Change) with high-resolution models, indicate:

• Temperatures: marked increase in all seasons, with longer, hotter summers and more frequent, intense and lasting heat waves.
• Rainfall: reduced rainfall in summer and increased intensity in autumn: less water is available, but concentrated in violent episodes.
• Coast: rising sea levels are amplifying erosion and the risk of storm surges, as shown by CMCC maps of the Adriatic and Tyrrhenian coastal areas.
• Health: More tropical nights and more days with temperatures perceived to exceed 35°C, with direct impacts on the most vulnerable populations, as documented by heat bulletins from Italian cities.

What concretely awaits Italy over the next 30 years? CMCC projections depict a country with increasingly longer and hotter summers, heat waves that go from exceptional to routine, tropical nights even in the Po Valley, less summer rain but more violent storms in autumn, more extensive wildfires, rapidly retreating Alpine glaciers, and coastlines under pressure from rising sea levels. Agriculture will have to coexist with less water and new crop varieties, cities will have to become greener, more shaded, and less impermeable, and healthcare systems will have to manage increasingly long, red-flagged summers. This isn't a disaster scenario; it's a snapshot of inevitable adaptation: starting earlier is cheaper, in terms of euros and lives.

For those living in Naples and Campania, change isn't a conference slide: it's a longer summer, a muggy evening heat, a warming sea, heat waves with peaks above 40 degrees Celsius (104 degrees Fahrenheit) requiring bulletins and precautions, and an electrical system strained by record consumption. The changing climate is palpable, and soon it will be felt in your wallet, too.

Italy's timetable 2026-2056

The global timetable applies to the entire planet, but Italy has its own timetable, with milestones slightly earlier than the global average because the Mediterranean is warming more rapidly. Here's what the CMCC and IPCC projections indicate for our country, year by year:

• 2026 (present): Global warming at +1,37°C; Italy is experiencing hotter summers, with increasingly frequent heat alerts in cities.
• 2026-2027: more intense and prolonged heat waves; recurring droughts in the South and the Islands; more widespread fires.
• ~2028: exhaustion of the global carbon budget for 1,5°C: Italy is already feeling the effects with a Mediterranean climate that is about 1°C warmer than in the 1981-2010 period.
• 2029-2030: Global average exceedance of 1,5°C; in Italy, tropical nights and days with perceived temperatures above 35°C are increasing.
• 2030-2035: Italian summers are about 1,5-2°C warmer than in the 1981-2010 period; less snow in the mountains, longer fire season.
• 2035-2040: Alpine glaciers in sharp retreat; violent thunderstorms and flash floods more frequent in autumn, with cities still poorly prepared.
• 2040-2045: Italy is expected to warm to around 2°C compared to the pre-industrial era; global sea level is expected to rise by approximately 10-15 cm compared to today, with more damaging coastal storm surges.
• 2045-2050: Sea level rise of 15-23 cm in all scenarios; coastal erosion and flood risk increasing in low-lying coastal areas.
• 2050-2056: Summers we now consider record-breaking are becoming the norm; how cities, agriculture, and healthcare adapt will determine how much we pay for the climate.

Infographic: Italy's 2026-2056 timeline. Sources: CMCC, IPCC AR6, WMO 2024.

How much time do we have left and what can we do?

This is the part that deserves the most attention, because it's the most misunderstood. Saying "we've passed the point of no return" and concluding that nothing needs to be done is scientifically incorrect. Tipping points aren't a single switch: they're a scale of risks that increases with every tenth of a degree. Every ton of CO2 avoided today reduces tomorrow's peak warming, and therefore the number of systems that will exceed their threshold.

Scientists are clear on this: the window to avoid the worst is still open, but it's closing fast. The carbon budget for 1,5°C runs out around 2028; that for 2°C, at the current rate, around 2050. We don't need to "save the planet" in the abstract: according to the IPCC, staying on the 1,5°C trajectory requires cuts in global emissions of nearly half by 2030 compared to 2019 levels (43% for greenhouse gases, 48% for CO2 alone). It's a steep climb, but not impossible: renewables are growing at unprecedented rates, electric cars are now mainstream, and solar costs have fallen by around 90% since 2010, according to IRENA.

And there is a second side of the coin that is often forgotten: the positive point of no returnThe Global Tipping Points Report 2023 reminds us that human societies also have their tipping points: when a technology becomes affordable and widespread enough, the transition accelerates on its own, as happened with solar panels. Triggering those tipping points is the concrete goal of climate policy.

In the meantime, the part that concerns us all is adaptation: making cities greener and more permeable, protecting coastlines, preparing healthcare systems for heatwaves, rethinking agriculture for new conditions. Not out of resignation: to reduce the damage of a climate that, even in the best-case scenario, will be hotter than the one we grew up in.

The point of no return, after all, isn't written in stone. It's written with the emissions of the coming years. And that date, unlike all the others, we can still change.

FAQ

Have we already passed the point of no return?

There is no single global tipping point: there are many, one for each climate system. For some (coral reefs, perhaps West Antarctica), the threshold has already been crossed or is imminent. For the system as a whole, the most cited date is the stable achievement of 1,5°C around 2030, with the carbon budget running out around 2028. Once the threshold is crossed, the risk of irreversible damage increases, but every tenth of a degree avoided reduces the damage: it's never "too late to do something."

When will we exceed 1,5°C of warming?

According to indicators updated at the beginning of 2026 (IGCC 2025), average warming will reach 1,5°C around 2030 if emissions continue at current rates. 2024 was already the first calendar year above that threshold (+1,55°C), and the three-year period 2023-2025 is the first with a three-year average above 1,5°C. However, the Paris Agreement refers to a 20-year average: that "official" exceedance is expected around 2030.

How much will sea levels rise by 2050?

IPCC projections indicate a rise of 15-23 centimeters by 2050, similar across all emissions scenarios because the sea responds decades later to warming already occurring. By 2100, the range widens: 28-55 cm in the best-case scenario, 63-101 cm in the high-emissions scenario. Over the very long term (2000 years), at 1,5°C, the sea level would rise by 2-3 meters.

How will the climate in Italy change in the next 30 years?

The Mediterranean is warming about 20% faster than the global average. For Italy, CMCC projections indicate longer, hotter summers, more heatwaves, less summer rainfall but more violent storms in autumn, more wildfires, and greater pressure on the coasts from rising sea levels. Cities will have to adapt: ​​more greenery, more shade, and more resilient electricity and water grids.

How much CO2 can we still emit?

The carbon budget for a 50% chance of staying below 1,5°C is around 130 billion tonnes of CO2 from the beginning of 2025: at the current rate (around 40 billion tonnes per year of CO2 alone), it will be exhausted around 2028. Total greenhouse gas emissions in 2024 were 57,7 billion tonnes of CO2 equivalent, a new record.

Can the Gulf Stream really stop?

The Atlantic AMOC current, of which the Gulf Stream is a part, has already weakened and, according to the IPCC, will continue to weaken this century. The scientific community is divided on whether a complete collapse will occur: the IPCC considers it unlikely before 2100, but recent studies (Ditlevsen & Ditlevsen 2023, van Westen et al. 2024) suggest that the risk is underestimated, with a central estimate of collapse around 2057 in the business-as-usual scenario. A collapse would disrupt the climate of Europe and the Atlantic.

Are climate forecasts reliable?

Yes, for what they are: scenarios, not prophecies. Medium-term temperature projections (2021-2040) are considered high-confidence by the IPCC because they depend on greenhouse gases already emitted and well-known physical laws. Uncertainty increases with the time horizon and depends on emissions choices: it's uncertainty about human behavior, not about physical models. The models have correctly predicted the warming observed in recent decades.

What can I actually do?

Individual actions (energy efficiency, less waste, sustainable mobility, lower-impact food) matter, but alone they're not enough: the bulk of the reduction must come from collective choices, laws, and investments. The most effective contribution of individual citizens is twofold: reducing their own footprint where they can and using their civic influence (vote, consumption, voice) to push collective decisions in the right direction. And prepare: knowing the risks in your area, from heat to floods, is the first form of adaptation.

Sources

The information in this article is based on the following scientific and institutional sources, all public and verifiable:

1. IPCC, Sixth Assessment Report (AR6), Working Group I: Climate Change 2021: The Physical Science Basis. Cambridge University Press, 2021.
2. IPCC, Sixth Assessment Report (AR6), Working Group II: Impacts, Adaptation and Vulnerability. Cambridge University Press, 2022.
3. IPCC, Sixth Assessment Report (AR6), Synthesis Report. 2023.
4. IPCC, Special Report on Global Warming of 1.5 °C (SR15). 2018.
5. World Meteorological Organization (WMO), State of the Global Climate 2024. Geneva, 2025.
6. World Meteorological Organization (WMO), Global Annual to Decadal Climate Update (2025-2029). 2025.
7. Copernicus Climate Change Service (C3S), Global Climate Highlights 2024 (2025) and Global Climate Highlights 2025 (2026).
8. Forster, PM et al., Indicators of Global Climate Change 2025: annual update of key indicators of the state of the climate system and human influence. Earth System Science Data, 2026.
9. United Nations Environment Program (UNEP), Emissions Gap Report 2025: Off Target. Nairobi, 2025.
10. Armstrong McKay, DI et al., Exceeding 1.5°C global warming could trigger multiple climate tipping points. Science, 377, eabn7950, 2022.
11. Lenton, TM et al., The Global Tipping Points Report 2023. University of Exeter, 2023.
12. Ditlevsen, P. & Ditlevsen, S., Warning of a imminent collapse of the Atlantic meridional overturning circulation. Nature Communications, 14, 4254, 2023.
13. van Westen, R.M., Kliphuis, M. & Dijkstra, H.A., Physics-based early warning signal shows that AMOC is on tipping course. Science Advances, 10, eadk1189, 2024.
14. Flores, BM et al., Critical transitions in the Amazon forest system. Nature, 626, 555-564, 2024.
15. Communications Earth & Environment (2025), West Antarctica Collapse Study (Ice Sheet Modeling, June 2025).
16. CMCC, Climate Scenarios for Italy (DataClime), and G20 Climate Risk Atlas. Euro-Mediterranean Center on Climate Change Foundation.
17. IRENA, Renewable Power Generation Costs (solar photovoltaic LCOE, -90% since 2010).
18. NASA/NOAA, satellite observations of sea level (altimetry, 1993–2025).

Article verified and updated in August 2026. The projections cited represent the state of the art in the scientific literature at the time of publication. Key facts verified with primary sources on August 5, 2026.