In the wake of the troubling reports about fires in Brazil’s Amazon rainforest, much misinformation spread across social media. On Facebook posts and news reports, the Amazon was described as being the “lungs of the Earth.” Peter Brannen, writing in The Atlantic, details why that isn’t the case—not to downplay the impact of the fires, but to educate audiences on how the various systems of our planet interact:
The Amazon is a vast, ineffable, vital, living wonder. It does not, however, supply the planet with 20 percent of its oxygen.
As the biochemist Nick Lane wrote in his 2003 book Oxygen, “Even the most foolhardy destruction of world forests could hardly dint our oxygen supply, though in other respects such short-sighted idiocy is an unspeakable tragedy.”
The Amazon produces about 6 percent of the oxygen currently being made by photosynthetic organisms alive on the planet today. But surprisingly, this is not where most of our oxygen comes from. In fact, from a broader Earth-system perspective, in which the biosphere not only creates but also consumes free oxygen, the Amazon’s contribution to our planet’s unusual abundance of the stuff is more or less zero. This is not a pedantic detail. Geology provides a strange picture of how the world works that helps illuminate just how bizarre and unprecedented the ongoing human experiment on the planet really is. Contrary to almost every popular account, Earth maintains an unusual surfeit of free oxygen—an incredibly reactive gas that does not want to be in the atmosphere—largely due not to living, breathing trees, but to the existence, underground, of fossil fuels.
Read Brannen’s piece in full here.
More from Science —
With thousands of members from all around the world, from artists and writers to engineers and farmers, the Long Now community has a wide range of perspectives, stories, and experience to offer. On October 20, 02020, we heard 12 of them in a curated ...
Explore over two decades of long-term thinking
- Climate Change