The climate crisis is the defining challenge of our generation — and it's already here.
A practical introduction to climate change: the science, impacts, solutions, and what's happening in 2025–2026.
In 2025, global CO₂ emissions from fossil fuels hit a record 37.2 gigatonnes — but the growth rate flattened to 0.7%. Clean electricity deployments avoided 10.3 Gt of emissions, and the power sector actually saw emissions decline by 0.9% year-over-year. That's the first structural decoupling of electricity demand from fossil fuel consumption in decades.
As of 2026, three technologies are converging: solar costs at record lows, sodium-ion batteries hitting GWh-scale production, and green hydrogen below $5/kg. Together, they make renewable energy + storage cheaper than new fossil fuel infrastructure for the first time in history.
Why Now?
- Sodium-ion batteries — CATL started mass manufacturing in 2025. In April 2026, the world's largest sodium-ion order was placed: 60 GWh of cells for energy storage, to be produced from 2028 at a cost of €770 million. CATL is the largest battery producer globally.
- Next-generation nuclear — Kairos Power became the first US company approved to begin construction on a next-gen reactor.
- Green hydrogen — Costs dropped below $5/kg, opening pathways for steel, shipping, and aviation.
Clean electricity deployments avoided 10.3 Gt of carbon emissions in 2025 — nearly a third of the emissions reductions needed annually to stay within 1.5 °C of pre-industrial temperatures.
— Nature Review Earth & Environment, 2026
Renewables accounted for 30% of global electricity in 2024 — the highest share ever. Solar alone added 447 GW. The gap isn't technology. It's pace.
- Policy: IRA, EU Green Deal, China's 15th FYP targets
- Finance: Climate finance flowed at $1.3 trillion in 2024 — still short of $4.5T needed
- Innovation: Perovskite solar cells hit 26.61% certified efficiency; flow batteries scaled to GWh level
Explore
- 📚 Core Resources — Key reports, datasets, and dashboards
- 🔧 Climate Assessment Tools — How scientists measure and model the crisis
- 📖 References & Key Papers — Foundational research from IPCC, Hansen, Rogelj
- 📌 Further Reading — Solutions, climate justice, decarbonization politics
