This is a data case study with interactive climate trend charts. View the full interactive version →
2023: What the Data Shows
The World Meteorological Organization confirmed in January 2024 that 2023 was the hottest year on record — by the largest margin over the previous record since instrumental measurement began. Global mean surface temperature was approximately 1.45°C above pre-industrial baseline (WMO Global Climate Status Report 2023; NASA GISTEMP v4).
This was not a projection. It was a measurement.
The significance: the Paris Agreement's lower target is 1.5°C of warming. 2023 briefly crossed that threshold in individual months. While a single year above 1.5°C doesn't mean the long-term trend has breached the target (climatologists assess the target over 20-year averages), it shows how close the margin has become.
Sea Level: The Slow Emergency
NASA's satellite altimetry data shows global mean sea level has risen ~10 cm since 1993 and is currently rising at approximately 4.4 mm/year — faster than at any point in the satellite record. The rate is accelerating.
Unlike temperature, which fluctuates year to year, sea level rise is cumulative and essentially irreversible on human timescales. A coastal city planning infrastructure today must plan for a range of sea level scenarios across its design life.
The IPCC AR6 Synthesis Report (2023) projects sea level rise of 0.28–1.01m by 2100 under medium-to-high emissions scenarios — with low-probability but high-consequence scenarios extending beyond 2m.
Who's Emitting What
The Global Carbon Project's 2023 data documents 36.8 billion tonnes of CO₂ emitted globally in 2022 — the highest on record. The five largest emitters in absolute terms are China (32%), USA (13%), EU (7.5%), India (7%), and Russia (5%).
But the per-capita picture inverts the ranking: the US emits 14.9 tCO₂ per person per year; India emits 2.4 tCO₂ — one-sixth. Historical cumulative emissions, which determine atmospheric concentrations, shift the picture further: the US and EU together have contributed more than China and India combined since industrialisation.
This tension between current emissions, per-capita emissions, and historical responsibility is central to every international climate negotiation.
The 1.5°C Gap
The Climate Action Tracker (2023) assessed national pledges submitted under the Paris Agreement and found that, if fully implemented, current policies would lead to approximately 2.5–2.9°C of warming by 2100 — far above the 1.5°C target, and above even the less ambitious 2°C goal.
The IPCC AR6 identifies the emissions reductions required to limit warming to 1.5°C: global CO₂ emissions must fall by 43% by 2030 and reach net zero by 2050. Current trajectories are not on that path.
What Doesn't Help the Discourse
Climate communication has a dual failure mode: panic that produces fatalism ("it's too late, nothing matters") and dismissal that produces inaction ("it's a natural cycle, not human-caused"). Both are contradicted by the data.
The data shows: warming is real, human-caused, accelerating, and within a range where meaningful mitigation is still possible. It also shows that the most dangerous scenarios require sustained political and economic change of a scale not yet observed.
What the Interactive Case Study Shows
The full case study includes:
- Global temperature anomaly chart from 1880 to 2023 (NASA GISTEMP data)
- Per-capita and absolute emissions comparison across major emitters
- Sea level rise trend with projection ranges
- The policy gap: current pledges vs. 1.5°C pathway
- Regional warming rates: which parts of the world are warming fastest
Explore the full interactive case study — temperature trends, emissions data, and policy analysis →