CCLXIX Global Warming and Climate Change} I would like to make a few things clear, using just the water available from all of the great rivers!

 Would in itself not be enough to replant and keep those plants alive if it is not done right! But by during large parcels, we will start to change the cloud production over certain areas but not others. This is where past histories of the planet will be of utmost importance, using a backward response to plant life and its loss is how to determine where we will get the most response with the least effort. In arid and semi-arid areas plant life dies in response to two needs, the first one is the amount of rainfall that normally would have fallen on these areas if the plant respiration was enough to increase both cloud cover and rainfall amounts, the second is the availability of carbon dioxide in the atmosphere, if the level is high then the plants will not need as much water to survive and produce. Areas that became arid or semi-arid back when the carbon dioxide levels were only at 220 parts per million may rebound a lot better than we would think it should, with the much higher levels than the planet is at now! Using C4 or cam planets for this ground cover in certain places would help in the way that less sunlight would be striking the bare surface of the planet and therefore reducing some if not a lot of the heat generation, but would do little in increasing plant respiration, and therefore cloud cover and the increase of rainfall. Both the offset of less daytime heat generation may go very far in controlling some of the rises of worldwide temperatures that have been causing more extreme weather around the planet. This is where climate scientists would come into play, where less water will only be available then C4 and cam plants would have to do until rainfall can be increased, and where there will be more water available then the use of mainly C3 plants would become a better chose (perhaps). One size never fits all, not even in baseball caps, so the more that we begin understanding how different areas of the planet respond to circumstances differently, we will need to be changing the game plan to better fit the needs! Farmers have used the term "to canopy" when the plant coverage of a field becomes dense enough so sunlight does not strike much of the bare ground, once this happens several things become easier, first, less growth of weed or other types of plants, second, the need for more water becomes less important, as the temperature of the field becomes lower, both due to the shading effect and due to less conversion of sunlight to heat (yes this are two separate causes, not just one.) Thank you, Dan!