The Kyoto Protocol is a plan created by the United Nations for the United Nations Framework Convention on Climate Change that tries to reduce the effects of climate change, such as global warming. The plan says that countries that adopt (follow) the Kyoto Protocol have to try to reduce how much carbon dioxide (and other "greenhouse gases" that hurt the atmosphere) they put into the air.
Duuude, that Kyotoprotocol! Shit, it really sucks -- its costing me way more money for gas now!