The greenhouse gases occur in small amounts in the Earth's atmosphere, yet they have an important role to play in keeping the Earth's surface warm and able to sustain life. Since the industrial revolution (about 150 years ago), human activities have led to an increase in the emission of greenhouse gases. read more
GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. read more
Greenhouse gas, any gas that has the property of absorbing infrared radiation (net heat energy) emitted from Earth’s surface and reradiating it back to Earth’s surface, thus contributing to the phenomenon known as the greenhouse effect. Carbon dioxide, methane, and water vapour are the most important greenhouse gases. read more