Kyoto Protocol negotiations on greenhouse gas emissions. Water and sanitation services contribute to greenhouse gas emissions. Transportation is a large contributor to greenhouse gas emissions. He opposes federal regulation of greenhouse gas emissions. Projections of future greenhouse gas emissions are highly uncertain. Heat recovery systems have a remarkable potential to contribute in decreasing greenhouse gas emissions. It is one of many aviation technologies being proposed to reduce greenhouse gas emissions. The accord commits nations to cutting greenhouse gas emissions. The SRES contains "scenarios" of future changes in emissions of greenhouse gases and sulfur dioxide. Tropical deforestation is responsible for approximately 20% of world greenhouse gas emissions. Capito opposes legislation aimed at capping greenhouse gas emissions. The effect of PHEVs on greenhouse emissions is complex. Some approaches might be used as accompanying measures to sharp cuts in greenhouse gas emissions. By 2020, Maldives plans to eliminate or offset all of its greenhouse gas emissions. In 1997, Kyoto hosted the conference that resulted in the protocol on greenhouse gas emissions.