Darryl Cunningham is carving out a nice little niche for himself as the Malcom Gladwell of comics, with sequential-art debunkings of moon-landing hoax theories, homeopathy, and the link between vaccines and autism. In his latest comic, he takes a look at climate change, both the scientific reasoning behind it and the political controversy surrounding it. Cunningham's cartoons tend to be a bit didactic, leaning on text boxes to convey chunks of facts and statistics, but they also do a good job of explaining the issues in a straightforward way; this is as good a primer as you'll get on the topic, and it's a nice read, too.