> "All greenhouse gas emissions come from one of five sources" > (Graphic shows electricity generation 28%, transportation 16%, agriculture 19%, buildings 7%, manufacturing 30%)

There's another large source of human greenhouse gas emissions that will perhaps be the most difficult to do anything about and which as far as I know we don't have much in the way of hard numbers about, and that is emissions from military activity. Not just wars, but ordinary peace-time training, patrol operations, hauling stuff around, and so on.