Drained wetlands that humans dug up for farming contain lots of carbon leaking into the atmosphere, which traps more heat. If the air is 1°C warmer, a little bit more water will evaporate than the ground gets back from rainfall each year. Once groundwater reserves reach zero, you have drought, starvation, less roots binding soil, and then just an unfertile desert like Mars. To let nature be alone, we must undo our damages so that nature can do it's job. Trees won't grow if we asphalt everything over.
Earth is full of basalt which processes CO2. We also have vegetation. I personally do not believe Earth can run out of water. It relocates, but it is recycled. It doesn't evaporate into space. Think of a well. If it empties, you move the pump and the old well will eventually fill up again. But I do agree 100% that nature takes care of the planet if we let it. Destroying trees doesn't help.