Environmental activist Greta Thunberg has deleted a 2018 tweet saying that climate change would ‘wipe out humanity’ unless the world ceased using fossil fuels by 2023.

The Swedish campaigner had tweeted an article by gritpost.com detailing Harvard University professor James Anderson’s warning that humanity would cease to exist if use of fossil fuels was not stopped within five years.

Thunberg’s now erased post stated: ‘A top climate scientist is warning that climate change will wipe out all of humanity unless we stop using fossil fuels over the next five years.’ 

The article on gritpost.com – whose website no longer exists – quoted Anderson, an atmospheric chemistry expert, where he argued there would be ‘essentially zero’ ice left in the Arctic by 2022.

It is unknown when exactly the tweet was deleted, but it was captured by internet archive Wayback Machine last week on March 7, just before 10pm.