The document discusses carbon banking and the Kyoto Protocol. Carbon banking allows countries to trade carbon credits, with countries emitting less than their target able to sell credits to countries emitting more. The Kyoto Protocol, signed by over 140 countries, committed industrialized nations to reducing carbon emissions by 5.2% below 1990 levels. However, the US has not ratified the treaty and it does not require developing countries like China and India to reduce emissions. Overall, the Kyoto Protocol has been ineffective at legally binding large emitters to reduce emissions.