The increase in fires burning in Brazil set off a storm of international outrage last week. Celebrities, environmentalists, and political leaders blame Brazilian president, Jair Bolsonaro, for destroying the world’s largest rainforest, the Amazon, which they say is the “lungs of the world.”
Singers and actors including Madonna and Jaden Smith shared photos on social media that were seen by tens of millions of people. “The lungs of the Earth are in flames,” said actor Leonardo DiCaprio. “The Amazon Rainforest produces more than 20% of the world’s oxygen,” tweeted soccer star Cristiano Ronaldo. “The Amazon rain forest — the lungs which produce 20% of our planet’s oxygen — is on fire,” tweeted French President Emanuel Macron.
And yet the photos weren’t actually of the fires and many weren’t even of the Amazon. The photo Ronaldo shared was taken in southern Brazil, far from the Amazon, in 2013. The photo that DiCaprio and Macron shared is over 20 years old. The photo Madonna and Smith shared is over 30. Some celebrities shared photos from Montana, India, and Sweden.
To their credit, CNN and New York Times debunked the photos and other misinformation about the fires. “Deforestation is neither new nor limited to one nation,” explained CNN. “These fires were not caused by climate change,” noted The Times. Amazon.com $25 Gift Ca... Buy New $25.00 (as of 05:40 EDT - Details)
But both publications repeated the claim that the Amazon is the “lungs” of the world. “The Amazon remains a net source of oxygen today,” said CNN. “The Amazon is often referred to as Earth’s ‘lungs,’ because its vast forests release oxygen and store carbon dioxide, a heat-trapping gas that is a major cause of global warming,” claimed The New York Times.
I was curious to hear what one of the world’s leading Amazon forest experts, Dan Nepstad, had to say about the “lungs” claim.
“It’s bullshit,” he said. “There’s no science behind that. The Amazon produces a lot of oxygen but it uses the same amount of oxygen through respiration so it’s a wash.”
Plants use respiration to convert nutrients from the soil into energy. They use photosynthesis to convert light into chemical energy, which can later be used in respiration.
What about The New York Times claim that “If enough rain forest is lost and can’t be restored, the area will become savanna, which doesn’t store as much carbon, meaning a reduction in the planet’s ‘lung capacity’”?
Also not true, said Nepstad, who was a lead author of the most recent Intergovernmental Panel on Climate Change report. “The Amazon produces a lot of oxygen, but so do soy farms and [cattle] pastures.”
Some people will no doubt wave away the “lungs” myth as nit-picking. The broader point is that there is an increase in fires in Brazil and something should be done about it.