Greenhouse gases — numbers to remember
3 sentencesThe car is two-thirds full.
Carbon dioxide (CO₂)=About two-thirds (~66%) of the warming from long-lived gases — the largest share · ≈ 424 ppm in 2024, 152% of pre-industrial
Mehul is twenty-eight.
Methane (CH₄)=About 27–30 times stronger than CO₂ per molecule (100 years) · second most important · rice fields, wetlands, cattle, coal mining
Nitin counted 273 stars.
Nitrous oxide (N₂O)=About 273 times CO₂ (100 years) · about 6% of human-made warming · now the largest ozone-depleting emission
The greenhouse effect itself is natural — without it the Earth would be about −18 °C instead of about 15 °C · water vapour is the biggest natural greenhouse gas · warmest year 2024 (1.55 °C above).