I don't understand global warming?

Yeah its going to cause evaporation, but not just because there is more sunlight, but because there is more sunlight to melt the ice in Antarctica. Melted ice means more water. More water means more evaporation. More evaporation means more condensation(raining). But.......... not necessarily in every part of the world. This causes less water in certain places (like where you live), and more water in other places.