These "lungs of the Earth" consume almost the entirety of the oxygen they produce directly. The oxygen that they do produce, indirectly, that we are able to con

These "lungs of the Earth" consume almost the entirety of the oxygen they produce directly. The oxygen that they do produce, indirectly, that we are able to consume comes from 'run-off' from the forest floor producing plankton blooms, which produce oxygen and sequester carbon as they fall to the ocean floor. What this would instead do is stop redistributing resources from a water-starved but resource-rich Africa to a water-rich but relatively resource-starved South America. Whether that's a good thing or not seems more like something to leave them to figure out amongst themselves, but I imagine it will be hard for hundreds of millions of Africans to turn down if it was possible to cheaply bring water there.