Never apologize for or otherwise undercut the argument you've made or leave your readers with the sense that "this is just little ol' me talking." Leave your readers with the sense that they've been in the company of someone who knows what he or she is doing. Also, if you promised in the introduction that you were going to cover four points and you covered only two (because you couldn't find enough information or you took too long with the first two or you got tired), don't try to cram those last two points into your final paragraph. The "rush job" will be all too apparent. Instead, revise your introduction or take the time to do justice to these other points.
As Americans face tough challenges in our economy today, the possibilties of alternative energy are quickly becoming the topic of conversation in the media. Although the concept of using alternative energy resources is not new, citizens seem to be opening their eyes and ears to these ideas due to the ultimate affect it would have on their wallets. While there are many benefits to consider when choosing alternatives resources, too many people fail to recognize the long lasting benefits it would have on our environment for years to come.