claim: Each unit of CO2 you put into the atmosphere has less and less of a warming impact.
evidence: The Kyoto Protocol is an international treaty which extends the 1992 United Nations Framework Convention on Climate Change ( UNFCCC ) that commits state parties to reduce greenhouse gas emissions, based on the scientific consensus that ( part one ) global warming is occurring and ( part two ) it is extremely likely that human-made CO2 emissions have predominantly caused it.