Earth’s climate system is changing at a pace unprecedented in the observational record. This document brings together four key datasets — global temperature anomalies, atmospheric CO2 concentration, renewable energy growth, and regional impact indicators — and lets you explore them interactively.
The numbers here draw from NASA GISS, NOAA GML, and IEA public data. Where exact annual figures are unavailable, values are interpolated from published decadal summaries.
Global Temperature Anomaly
The chart below plots the deviation of each year’s global mean surface temperature from the 1951-1980 baseline, following the NASA GISS methodology. The trend is unmistakable: the last decade contains every one of the ten warmest years on record.
Key observations:
- 1950–1980: Temperatures fluctuated around the baseline, with no sustained trend.
- 1980–2000: A clear warming signal emerged — roughly +0.2°C per decade.
- 2000–2025: The rate accelerated. 2023 and 2024 shattered previous records, exceeding +1.2°C above the pre-industrial baseline for the first time.
The “hockey stick” shape of this curve is one of the most reproduced results in climate science: dozens of independent research groups, using different methods and data sources, converge on the same trajectory.
Atmospheric CO2: The Keeling Curve
Charles David Keeling began measuring CO2 at the Mauna Loa Observatory in 1958. His continuous record — now the longest instrumental CO2 dataset in existence — reveals both the seasonal breathing of the biosphere and the relentless upward march of fossil-fuel emissions.
The annual growth rate has itself been accelerating. In the 1960s, CO2 rose by about 0.8 ppm per year. In the 2020s, the rate exceeds 2.5 ppm per year. At current trajectories, 450 ppm — a concentration associated with roughly 2°C of warming — could be reached before 2040.
Renewable Energy Capacity
Against this backdrop, the energy transition is underway. Global renewable electricity capacity has grown from under 1,000 GW in 2010 to over 4,200 GW in 2024. Solar alone added more capacity in 2023 than any single energy source in any prior year.
Solar’s trajectory is the standout story. Its installed capacity has doubled roughly every three years, driven by a 90% drop in module costs since 2010. Wind has followed a steadier linear growth path. Hydropower, already mature, grows slowly — constrained by geography and environmental concerns around new dam construction.
Regional Climate Impacts
Climate change does not affect all regions equally. The Arctic is warming roughly four times faster than the global average. Small island nations face existential sea-level rise. The Sahel region experiences intensifying drought cycles. Meanwhile, mid-latitude regions see more extreme precipitation events.
| Region | Key Impact | Observed Change |
|---|---|---|
| Arctic | Sea ice loss | September minimum down 40% since 1979 |
| South Asia | Monsoon intensification | Extreme rainfall events up 30% since 1950 |
| Mediterranean | Drought and wildfire | Fire season 40 days longer than in 1980 |
| Small Island States | Sea level rise | 15–20 cm since 1900; accelerating |
| Western North America | Heat extremes | Heat waves 3x more frequent since 1960 |
| Sub-Saharan Africa | Agricultural stress | Growing season shortened by 5–20 days |
| Central Europe | Flooding | Major flood events doubled since 1980 |
These impacts compound: agricultural stress drives migration, which strains infrastructure in receiving regions. Heat extremes increase energy demand for cooling while simultaneously reducing power plant efficiency. The economic costs are non-linear — each additional tenth of a degree of warming produces disproportionately larger damages.
Carbon Footprint Estimator
Individual choices exist within a larger systemic context, but understanding your personal footprint helps frame the scale of the problem. Use the estimator below to see how common activities contribute to annual CO2 emissions.
The estimator above is intentionally simple. It covers four categories that together account for the majority of a typical household’s direct emissions. What it cannot capture is equally important: the embedded carbon in goods and services, the emissions from infrastructure, and the systemic choices — grid composition, urban design, industrial policy — that individuals do not control.
What the Data Tells Us
Three conclusions emerge clearly from the data:
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The warming signal is unambiguous. Every major temperature dataset — NASA GISS, HadCRUT, Berkeley Earth, ERA5 — tells the same story. The 2020s are tracking well above +1°C relative to pre-industrial baselines, with 2024 marking the first calendar year above +1.5°C in some datasets.
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CO2 accumulation is accelerating, not stabilizing. Despite the growth in renewables, global emissions have not peaked. Atmospheric CO2 continues to rise at an increasing rate. The Keeling Curve does not yet show the bend that would indicate a turning point.
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The energy transition is real but insufficient at current pace. Renewable capacity is growing exponentially — particularly solar. But the energy system has enormous inertia. Fossil fuels still supply roughly 80% of primary energy globally. Closing that gap within the timeline climate science demands requires sustained acceleration.
The gap between where we are and where we need to be is not a reason for fatalism. It is a measurement — and measurements are the starting point for action.
Data sources: NASA Goddard Institute for Space Studies (GISS), NOAA Global Monitoring Laboratory (GML), International Renewable Energy Agency (IRENA), International Energy Agency (IEA), Our World in Data (OWID), U.S. EPA, ICAO.