Corporations using ‘ineffectual’ carbon offsets are slowing path to ‘real zero’, more than 60 climate scientists say

Trees used to offset emissions rerelease carbon back into the atmosphere when they die, such as in droughts or wildfires. Photograph: Richard Newstead/Getty Images

Carbon offsets used by corporations around the world to lower their reportable greenhouse gas emissions are “ineffectual” and “hindering the energy transition”, according to more than 60 leading climate change scientists.

A pledge signed by scientists from nine countries, including the UK, the US and Australia, said the “only path that can prevent further escalation of climate impacts” was “real zero” and not “net zero”.