How old is the climate crisis?
I was born in 1994, when the concentration of CO₂ in the atmosphere was measured at 360 parts per million; today it is close to 420. Furnaces, engines and former forests emitted 23 billion tonnes of this planet-warming gas in 1994; today they spew more than 37 billion tonnes. With some exceptions (economic downturns, the pandemic), humanity has released more CO₂ into the atmosphere each year than the one before it for at least two centuries.
