The photo on the left was actually taken in 1989, Snopes reports, and can be seen in a 2007 Guardian article on deforestation of the South American forest.

The image on the right isn't new either - it was used in an article published in 2012 by journal Nature, credited as a stock image.

The tweet - and others sharing it on social media - has raised awareness of the Amazon's current fires, which are at 'record levels' - but only according to a single source, and only if you ignore every year before 2013.

Brazil's National Institute for Space Research (INPE) says there have been more than 72,000 individual blazes this year - up 80 percent on 2017 at the same time of year. But they've only been counting them since 2013.