You should probably pick a single aspect of global warming to focus on. After all, global warming, as a whole, has both benefits and drawbacks. Most of Canada and Russia, for instance, would likely benefit overall from global warming. Africa, on the other hand, and coastal regions of the aforementioned countries (of all countries, for that matter) are likely to be more negatively affected. So, to even term global warming a problem is problematic, unless you narrow down your subject a bit more. So, you could look a rising sea levels, harsher hurricanes, severer droughts in some regions, the risk of a deep freeze in much of Europe, etc. Pick one of these issues, then look at the causes and possible solutions to it.
Sean, EssayForum.com