Six charts trace the arc of global warming — from the first thermometer readings in 1880 to the economic forces already in motion.
In 1880, the planet's average surface temperature sat roughly 0.16°C below the 1951–1980 baseline. Industrial activity had been scaling for decades, but the atmosphere still behaved like an open account. Carbon dioxide hovered near 290 parts per million — a level the Earth had not meaningfully exceeded in 800,000 years.
By 2024, that anomaly had crossed 1.2°C above baseline. The chart tells a story of acceleration: the first 0.5°C took nearly a century. The next 0.7°C arrived in forty years. The 10 warmest years on record have all occurred since 2014.
The orange line below is the smoothed trend. It refuses to flatten.
The atmosphere gets the headlines, but the ocean does the bookkeeping. More than 90 percent of the excess heat trapped by greenhouse gases has been absorbed by the sea. Surface warming is the visible symptom. The hidden fever runs deeper.
Since 1955, the top 2,000 metres of the global ocean have absorbed roughly 380 zettajoules of extra energy — the equivalent of detonating five Hiroshima-size bombs every second, continuously, for seventy years. Most of that heat sits in the upper 700 metres. But the deeper layer is warming faster now than it was three decades ago. Ocean heat content in the 700–2,000m layer has risen 40% since 2005 alone.
Species do not read climate reports. They read temperature. And the temperature says: move.
Marine organisms — plankton, fish, crustaceans — are shifting poleward at a median rate of 59 kilometres per decade. That is faster than terrestrial species, which manage about 17 kilometres. The difference matters because fisheries, food webs, and coastal economies are all pegged to the assumption that species stay where they have always been. North Atlantic cod have shifted their range north by over 200 km since 1980.
Each connected dot below represents a measured range-centroid shift for a marine species group across a decade. The vector is consistently north.
Sea-level rise is not a single number. It is a regional story shaped by ocean currents, land subsidence, and gravitational effects that most people will never feel — but will definitely pay for.
Under a high-emissions scenario, South Asia could see over 80 centimetres of rise by 2100. The Western Pacific faces similar exposure with far fewer resources to adapt. Even under the most optimistic pathway — rapid decarbonisation and net-zero by 2050 — coastal cities from Miami to Manila would still confront 40 to 55 centimetres by century's end. Over 600 million people live in low-elevation coastal zones vulnerable to a one-metre rise.
Climate change does not arrive as a line item in a national budget. It arrives as crop losses, uninsurable homes, heat-stressed workers, and ports that cannot operate at full capacity for weeks at a time.
Network for Greening the Financial System models project that, without adaptation, a 3°C warming trajectory could shave 8 to 12 percent off global GDP by 2100. Agriculture and coastal real estate bear the most direct costs. But the cascade hits energy systems — higher cooling demand, lower thermal-plant efficiency — and insurance markets that are already retreating from exposed regions. By 2050, climate-attributed losses to global GDP could exceed US$23 trillion annually.
The five charts behind us describe momentum — physical, biological, economic — already in the system. The question now is whether the sixth line, global emissions, bends soon enough.
The fan chart below maps four emissions pathways against observed data. The lowest pathway — RCP 2.6 — requires emissions to peak within this decade and fall to near zero by 2070. The highest, RCP 8.5, describes a world where coal use continues to rise and carbon removal never scales. Observed emissions sit closer to the middle scenarios, but the gap between current pledges and the 2°C ceiling remains wide. Current policies track closest to 2.7°C of warming by 2100 — a long way from Paris.