The transition from environmental to political issues in the climate change debate, from scientists to governments and other agencies of negotiation and decision-making, brings new stakes into the climate change issue, particularly as they affect the relations between northern industrialised countries and southern developing countries. The atmospheric level of methane has approximately doubled over the last 100 years and is now increasing by about 0.016 ppm annually. About 50 million metric tons of NOx is produced each year. A three fold increase in NOx emissions from the energy sector is projected for the next 50 years. Abrahamson, The Challenge of Global Warming.
Carbon monoxide is formed through incomplete oxidation of carbon.
About three-quarters of the present global emission results from human activity. Abrahamson, The Challenge of Global Warming. Cicero, University of Oslo.