The eclectic blog Environmental Graffiti very nicely summarizes the five major impacts that global warming with have in the areas of economics, health, and ecosystems. The five major impacts are: (1) spread of disease; (2) increase in ocean temperature, resulting in more hurricanes; (3) increase in drought and heat waves; (4) increase in damage costs due to hurricanes and increase in costs to fight diseases; and, (5) melting of the polar ice caps, which will raise sea levels, alter ecosystems, and endanger several species of animals. A link to the blog post is:

http://www.environmentalgraffiti.com/sciencetech/5-deadliest-effects-of-global-warming/276

Environmental Graffiti bills itself as a blog "for environmentalists who don't take themselves too seriously", and in that vein the blog also has a tongue-in-cheek satirical post on "The Top 5 “Positive” Effects of Global Warming". A link to that post is:

http://www.environmentalgraffiti.com/offbeat-news/the-top-5-positive-effects-of-global-warming/728