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Comment by pinkfoot | Hacker News Reader

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A fair amount of the phosphorus in the Amazon comes from dust storms originating in the Sahara.

[1] https://www.nasa.gov/content/goddard/nasa-satellite-reveals-...

given that the Sahara is only a couple thousand years old does that mean the amazon is just as young?

Very good question.

An interesting article on how people shaped the Amazon.

https://www.theatlantic.com/science/archive/2017/03/its-now-...

The Amazon is much younger; much of what is jungle today wasn't before the Columbian Exchange.

There is a theory that American reforestation was responsible for the Little Ice Age.

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