The numbers are no longer projections. They are the present tense. Temperatures breached the Paris threshold in 2024, adaptation finance is running billions short, and 673 million people still go hungry — with climate change listed as a primary cause. Here is everything you need to know, in one place.
The year 2024 arrived with a verdict that climate scientists had long feared would come. The World Meteorological Organization confirmed that 2024 was the warmest year in 175 years of observational records, with a global mean near-surface temperature of 1.55°C above the 1850–1900 pre-industrial average. It was not merely a record — it was a threshold. For the first time, a full calendar year had breached 1.5°C of warming, the symbolic and scientific ceiling set by the 2015 Paris Agreement as the boundary beyond which the risks of climate change become dramatically harder to manage. The ten years from 2015 to 2024 are now confirmed as the ten hottest ever measured, an extraordinary and unbroken streak documented by WMO's State of the Global Climate 2024 report. A single year crossing 1.5°C does not mean the Paris goal is officially dead — that threshold refers to long-term averages, not individual years — but it is an unmistakable signal of direction. The planet is not stabilizing. It is accelerating.
The physical mechanism behind this acceleration is straightforward even if its consequences are not. Atmospheric concentrations of CO₂ reached 423.9 parts per million in 2024, a 53 percent increase above the pre-industrial level of around 278 ppm, with methane and nitrous oxide also reaching all-time highs. These greenhouse gases trap heat, and the oceans absorb the vast majority of it — about 90 percent of the excess heat from global warming is stored in ocean water, making ocean heat content a critical indicator of where the climate system actually stands. The upper 2,000 metres of the global ocean increased in heat content by approximately 23 zettajoules from 2024 to 2025 alone — a figure that the researchers involved note is around 200 times the world's total electricity generation in 2024. When people debate whether climate change is "real," this is the number worth sharing: 200 times the world's electricity production, absorbed as heat by the ocean, in a single year. The warming is not hypothetical. It has a measurement.
For communities across Sub-Saharan Africa, that warming has been felt most viscerally as a crisis of food. Agricultural productivity across the African continent has declined by 34 percent since 1961 due to climate change, more than in any other region of the world, according to the IPCC's Sixth Assessment Report. The rains arrive later, depart earlier, or fail to arrive at all. The soils dry out faster. Crops that once reliably yielded enough to feed families now produce fractions of what they should, and those failures compound in ways that statistics rarely fully capture — a failed harvest means not just hunger today but the sale of livestock tomorrow, the withdrawal of children from school next week, and the collapse of the household economic base over the following years. The UN's State of Food Security and Nutrition in the World 2024 report — co-authored by FAO, WFP, UNICEF, IFAD, and WHO — documented that between 713 and 757 million people faced hunger in 2023, with Africa's hunger rate surpassing 20 percent, affecting 307 million people. One in every five people on the continent. A 2024 update brought modest global improvement — roughly 673 million people experienced hunger in 2024, or 8.2 percent of the global population — but hunger continued rising in most subregions of Africa and in western Asia, where 12.7 percent of the population, or more than 39 million people, faced food insecurity. Still, 2.3 billion people globally faced moderate or severe food insecurity in 2024 — a number that refuses to fall fast enough.
Weather extremes are a primary driver of these food crises, and the data is now unambiguous. According to the 2024 Global Report on Food Crises, weather shocks — particularly El Niño-induced droughts and floods — pushed 18 countries into food crises affecting over 96 million people. Flooding was widespread. El Niño caused crop failure across large parts of southern Africa. More than 295 million people in 53 countries and territories experienced acute levels of hunger. Famine was confirmed in Sudan. These are not events that can be attributed to climate change in isolation — conflict and economic collapse are co-drivers — but climate change is the accelerant that turns a difficult situation into a catastrophic one, and the IPCC Sixth Assessment Report has made clear that the frequency, intensity, and geographic reach of such weather extremes will continue to grow as temperatures rise. There is no version of the future in which food systems get easier to manage as the climate gets harder to predict.
The water dimension of the climate crisis sits at the root of almost every other dimension. More than 2 billion people currently live in water-stressed countries, and the IPCC projects that by 2050, half the global population could be exposed to periods of severe water stress. In Asia — home to more than half of humanity — increasing floods, droughts, and heat stress are already having measurable adverse impacts on food availability and prices. Cities in India are experiencing intensifying heat stress, urban floods, and climate-induced cyclones, and Indian megacities will be home to 600 million people within the next 15 years, a population concentration that amplifies every climate risk. Glaciers in the Himalayas and Hindu Kush feed the rivers that irrigate the fields of hundreds of millions of farmers across South and Southeast Asia. Those glaciers are retreating at rates that, if continued, will first cause floods as they melt rapidly, and then severe water shortages as the ice reserves disappear. The long-term consequences for agricultural civilizations that have depended on glacial meltwater for millennia are almost too large to fully contemplate.
For small island developing states — the SIDS — the climate crisis is not a future threat. It is an existential present. Global sea levels have risen by approximately 20–23 centimetres since 1880, and the rate of rise has more than doubled in the last decade compared to the 1990s. In Tuvalu, sea levels have risen approximately 13.2 centimetres between 1993 and 2021 alone, at a trend of 4.7 millimetres per year. In Kiribati, whose land surface rises nowhere more than 2–3 metres above sea level, ocean waves have reached 3.5 metres in the past five years. The IPCC's Sixth Assessment Report Chapter on Small Islands finds that coastal land loss attributable to higher sea levels, increased extreme precipitation, and wave impacts has already contributed to food and water insecurities that are likely to become more acute in many places. Saltwater intrusion into freshwater lenses — the fragile underground water supplies of low-lying atolls — is rendering drinking water saline and rendering agriculture impossible. These are not projections for 2100. They are conditions that families in Kiribati, Tuvalu, the Marshall Islands, and the Maldives are navigating in the present decade. Average sea levels could rise by up to 90 centimetres by 2100 under worst-case scenarios, and even limiting warming to 1.5°C would still commit the oceans to significant further rise due to the thermal inertia already locked into the system. For these nations, the Paris Agreement's 1.5°C target is not a climate policy preference. It is the line between continued existence and national erasure.
Around 900 million people — nearly 1 in 10 globally — live in low-lying coastal zones, and by 2030, up to 116 million people in Africa alone could be exposed to sea-level rise. Major coastal megacities — London, Tokyo, New York, Buenos Aires, Mumbai — face escalating flood risk even with moderate warming. The Western Pacific is already experiencing sea-level rise up to four times the global average. The Caribbean has seen rising seas devastate tourism and agriculture, the economic foundation of many island economies. Densely populated low-lying deltas in Bangladesh, Vietnam, and Egypt face the twin threats of rising sea levels and saltwater intrusion into agricultural land, threatening the food production systems that hundreds of millions depend on for their daily survival.
Extreme weather is the most immediately visible face of the crisis, and 2024 delivered it in every form. The WMO's State of the Global Climate 2024 report documented massive economic and social upheavals from extreme weather, including record ocean heat, accelerating sea-level rise, and temperatures that shattered historical records on every continent. The State of the Climate in Africa 2024 report found that extreme weather and climate change are intensifying hunger, insecurity, and displacement across Africa, impacting every facet of socioeconomic development. In South Asia, disaster displacements nearly tripled in 2024 to reach 9.2 million — the second highest for the region in more than a decade — while cyclones accounted for 54 percent of all global disaster displacements that year. The Americas recorded a historic 14.5 million internal displacements from disasters in 2024, more than the previous five years combined. Heatwaves killed people across southern Europe, North Africa, and South Asia in numbers that exceeded official death tolls because heat deaths are systematically undercounted. Wildfires consumed forests from Canada to Greece to Australia at scales that rewrote scientific understanding of what was possible.
The gap between what is needed and what governments are delivering has become the defining political feature of the climate era. The UNEP Emissions Gap Report 2024, titled "No more hot air…please!" — delivered its 15th annual assessment with characteristic clarity and barely concealed alarm. Without dramatically stronger national climate pledges, the world is on course for a temperature rise of 2.6–3.1°C this century. That is not a scenario governments should be planning for. It is a scenario that leading climate scientists describe as incompatible with organized civilization as we know it. To stay on track for 1.5°C, nations collectively need to cut annual greenhouse gas emissions by 42 percent by 2030 and 57 percent by 2035. Current commitments fall catastrophically short of those targets. Annual global greenhouse gas emissions in 2024 were 2.3 percent higher than in 2023 — more than four times the annual average growth rate seen in prior years. The trajectory is not bending. The gap is widening.
Every fraction of a degree matters, and the science of why has become increasingly precise. At 1.5°C of warming, coral reef systems are severely degraded but not entirely destroyed; at 2°C, the IPCC projects that over 99 percent of coral reefs will be eliminated — eliminating the marine ecosystems on which roughly one billion people depend for food and coastal protection. At 1.5°C, extreme heat events that were once expected once every 50 years now occur once every 8.6 years; at 2°C, once every 5.6 years. Crop yield projections for wheat, rice, and maize deteriorate significantly with each additional degree. The economic costs are not linear — they accelerate, with each additional increment of warming carrying disproportionately heavier damage than the last. The case for aggressive emissions reduction is simultaneously a case for limiting economic catastrophe, and the UNEP report frames it plainly: if action is delayed until 2030, the required annual emission reductions would rise to 8 percent for 2°C and 15 percent for 1.5°C — rates so steep as to be politically near-impossible.
The finance dimension of the climate crisis is where the gap between political promise and physical reality becomes most glaring. In 2009, developed nations pledged to mobilize USD 100 billion per year in climate finance for developing countries by 2020. That target was missed by years. The UNEP Adaptation Gap Report 2024 documents that even after a notable increase, international public adaptation finance flows to developing countries reached only USD 28 billion in 2022, while the actual adaptation costs for developing countries this decade are estimated at between USD 215 billion and USD 387 billion per year. That gap — the difference between what is needed and what flows — sits at USD 187–359 billion annually. Even fully achieving the Glasgow Climate Pact goal of doubling adaptation finance to USD 38 billion by 2025 would close only about 5 percent of the adaptation finance gap. The UNEP's Adaptation Gap Report 2025 extended this analysis through 2035, finding adaptation finance needs in developing countries will reach over USD 310 billion per year by 2035 — approximately 12 times the current level of international public adaptation finance. The numbers are not simply large. They represent the difference between communities that can prepare and adapt versus communities that cannot — and the countries least able to afford adaptation are overwhelmingly the same countries that contributed least to the emissions that created the problem.
The Loss and Damage Fund, agreed upon at COP28 in Dubai in late 2023, represents a historic acknowledgment that some climate impacts are now beyond adaptation — that floods, droughts, and sea-level rise are already causing irreversible losses and that wealthy nations bear a responsibility to compensate. But as with all climate finance commitments, the gap between symbolic agreement and actual funding has been immediate and wide. The fund's initial capitalization was a fraction of what vulnerable nations and scientists said was needed, and studies indicate that every billion invested in adaptation against coastal flooding leads to a USD 14 billion reduction in economic damages — a return ratio that makes the reluctance of wealthy nations to invest in adaptation one of the stranger acts of collective self-harm on the contemporary policy landscape.
The IPCC's Sixth Assessment Report Synthesis, the most comprehensive review of climate science ever produced, found that human influence has unequivocally warmed the atmosphere, ocean, and land, and that widespread and rapid changes have already occurred across the climate system in every region. Biodiversity loss is accelerating as species ranges shift too quickly for ecosystems to adapt. Coral bleaching events that once occurred once every 27 years now occur every six years on average. Arctic sea ice is at record lows; Antarctic sea ice reached historically low values through large parts of 2024. The ice sheets of Greenland and West Antarctica are melting at rates that have locked in future sea-level rise regardless of what emissions pathways we now choose. Some changes are irreversible on human timescales. Some damage is already done. The question the IPCC and the WMO have stopped asking is whether climate change is happening. The question now is how bad it will be, and that answer depends entirely on what we do in the next ten years.
What makes the present moment particularly paradoxical is that the solutions are available, increasingly affordable, and generating measurable results where deployed. The cost of solar photovoltaic energy has fallen by more than 90 percent over the past decade. Wind power is now the cheapest source of new electricity generation in most of the world. Electric vehicle adoption is accelerating across major markets. Reforestation, mangrove restoration, and regenerative agriculture offer scalable pathways to both mitigation and adaptation. The WMO's State of Global Climate 2024 report emphasizes the vital importance of early warning systems and climate services — investments that protect lives and livelihoods at a fraction of the cost of disaster response after the fact. The UNEP Adaptation Gap Report 2025 notes real progress: most countries now have at least one national adaptation policy, and countries have reported over 1,600 implemented adaptation actions. The green transition is underway. The problem is that it is moving at the speed of optimism in a system that requires the speed of necessity.
The distributional injustice at the heart of the climate crisis is perhaps its most morally urgent feature. The countries that have done the most to drive greenhouse gas emissions — the industrialized economies of North America, Europe, and more recently China — are not the ones bearing the heaviest costs. Bangladesh, which contributes less than 0.3 percent of global emissions, faces catastrophic flood risk, severe cyclone exposure, and long-term agricultural collapse from saltwater intrusion. Ethiopia, Somalia, and the Sahel face desertification and drought on a scale that is reshaping where and how people can live. The State of the Climate in Africa 2024 report makes the injustice explicit: a continent that has contributed the least to global warming faces its most severe consequences, with extreme weather intensifying hunger, insecurity, and displacement across every region. The IPCC's Working Group II report is equally direct: the risks from climate change are not distributed evenly, and the communities with the fewest resources to adapt are precisely those facing the greatest exposure to harm.
This is a moment of compounding crises, and the compounding matters. Drought triggers crop failure, which causes hunger, which drives migration, which destabilizes receiving communities, which creates political pressure, which weakens international cooperation, which slows climate action, which worsens the drought. The feedback loops run in both directions — climate change makes food systems more fragile; food system fragility makes communities less able to invest in climate resilience. WMO's 2025 State of the Global Climate report confirmed that 2015–2025 are the hottest eleven years on record, and that the ocean absorbs the equivalent of approximately eighteen times annual global human energy use each year. That is the scale of energy driving the physical system that every human being on Earth depends on for survival. It is not a policy preference. It is physics.
What the data from WMO, IPCC, UNEP, FAO, and the broader UN system collectively demands is not incremental adjustment but structural transformation — in energy systems, in land use, in finance, in governance, and in the fundamental way wealthy nations understand their obligations to the rest of the world. UNEP Executive Director Inger Andersen's framing at the release of the 2024 Emissions Gap Report was unambiguous: "Climate crunch time is here. We need global mobilisation on a scale and pace never seen before." That statement was not rhetorical. It was a precise description of the mathematics of carbon budgets and the window that remains. The Paris Agreement created the framework. The NDCs — national climate pledges — are the mechanism. The science is the alarm. What is still missing, ten years after Paris, is the political will to act at the scale the alarm demands. The burning planet will not wait for consensus to catch up with combustion.
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