It’s my understanding that the Amazon is dependent on minerals from the Sahara blowing across the ocean, and if we “re-greened” the Sahara, the Amazon would be negatively affected.

Is this the case, and if so, does that mean the Amazon is only as old as the desert version of the Sahara?

Edit: bit of an answer here for anyone curious: https://earthscience.stackexchange.com/questions/2566/what-w...