Most of humanity's carbon emissions happened in living memory, not centuries ago

Wallace-Wells opens with a fact designed to puncture the comfortable myth that climate change is the slow accumulation of the entire industrial era. More than half of all the carbon dioxide humanity has ever emitted from fossil fuels has been released since the late 1980s — within the lifetime of most adults reading the book, not since the steam engine.

This matters because it undercuts the idea that no single generation is responsible, or that the crisis crept up on a species that couldn't have known better. The scientific warnings — including formal testimony to the U.S. Congress in 1988 — arrived before most of the damage was done, not after.

The reframing is deliberately uncomfortable: this isn't inherited sin from a distant industrial past, it's a choice made, and continually renewed, by recent and current generations with full awareness of the consequences. The climate crisis isn't ancient history catching up with us — it's a live decision being made again every year.