The Amazon rainforest is often said to produce 20% of Earth's oxygen. What's closer to the truth?

The answer

The Amazon does produce a huge amount of oxygen through photosynthesis, but the forest's own respiration and decomposition use up nearly all of it. The net contribution to the atmosphere is small — ocean phytoplankton do far more of that work.

Correct answer: It produces a large share but consumes almost as much