Scientists have warned for more than a decade that concentrations of more than 450ppm risk triggering extreme weather events and temperature rises as high as 2C, beyond which the effects of global heating are likely to become catastrophic and irreversible.


My pledge – 1 flight in 2021.

CO2 levels in the atmosphere

26 March 2021: 418.74 ppm
This time last year: 414.34 ppm
10 years ago: 392.22 ppm
Pre-industrial base: 280
Safe level: 350