How Greenhouse gases are admitted into the environment

Together with hydrogen, carbon dioxide is the main greenhouse gas. However, hydrogen is not emitted during industrial processes. Humans do not contribute to the hydrogen amount in the air, this is only changing naturally during the hydrological cycle, and as a result it is not a cause of global warming.

Various human activities that contribute to the emission of carbon dioxide gas have been mentioned. Of these activities fossil fuel combustion for energy generation causes about 70-75% of the carbon dioxide emissions, being the main source of carbon dioxide emissions. The remaining 20-25% of the emissions is caused by land clearing and burning and by emission from motor vehicle exhausts.

Most carbon dioxide emissions derive from industrial processes in developed countries, such as in the United States and in Europe. However, carbon dioxide emissions from developing countries are rising. In this century, carbon dioxide emissions are expected to double and they are expected to continue to rise and cause problems after that. Carbon dioxide remains in the troposphere about fifty up to two hundred years.