Not science fiction.
It's already happening.
Timeline below synthesizes IPCC AR6 / NASA / WMO / WRI mainstream scenarios. Not the worst case — the median path of "do nothing".
+1.5°C is locked in
IPCC AR6: even with immediate zero emissions, the world will breach the Paris 1.5°C line around 2030. Arctic ice-free summers expected 2030–2050.
2 billion face extreme heat
Middle East / South Asia / sub-Saharan Africa will see double the days exceeding 35°C wet-bulb. 6 hours outdoor labor becomes lethal. Power grids collapse.
Sea +30cm, 100M displaced
Pudong Shanghai / Old Jakarta / Miami South Beach / Venice old town periodically submerged. Bangladesh produces 17M climate refugees.
Amazon hits 'death tipping'
After losing 40%+ rainforest area, regrowth fails. Carbon sink becomes carbon source. +80ppm to the atmosphere within two years.
If we do nothing
+4°C global. All coral reefs dead. Sixth mass extinction enters acceleration. 3 of 7 billion humans live in 'climate-uninhabitable' zones.
Change starts with one tiny act.
A bottle of air won't reverse +1.28°C. But every cent really lands on the bank account of 5 NGOs doing real work on this planet.
Buy one. Cast one vote.