To ask ourselves as individuals what we can do about global warming. One person, one child, one family, one school, one community, and one nation at a time can globally make a difference by planting trees. Action is better than inaction. We can all make a difference together. The USA occupies a substantial portion of North America with a population of 301,139,947. (July 2007 est.) If one half of one percent of us plants a tree, nurtures it, watches over its survival, we will have over 1.5 million trees.