Does the mammals (future humans) at 65 million y.a. relation to earthworms being several feet length S. Africa?

Keep asking yourself the questions, but do the work to learn the science behind the answers. All precipitation (rain or snow) is fresh water. Mammals were better able to survive dramatic environmental change. But it's because they weren't so highly tuned to their environment that they were fragile to changes. I doubt it had anything to do with digging. Nearly all glacial ice was formed from precipitation, not from purification by freezing salt water. Transporting water to African desert areas is very expensive. Wells and wise water management and hygiene are much more economical. How much money are you donating to ist this effort? World Vision is doing a really good job of efficiently deploying appropriate technologies. If you care about the thirsty people in Africa, that's probably the best way to help.