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Human activities have led to a build up of extra greenhouse gases in the atmsophere;

 phenomenon where gases allow sunlight to enter Earth's atmosphere but make it difficult for heat to escape greenhouse gas Noun gas in the atmosphere, such as carbon dioxide, methane, water vapor, and ozone, that absorbs solar heat reflected by the surface of the Earth, warming the atmosphere habitatIt might be surprising to find out that the three main greenhouse gases – carbon dioxide, methane and nitrous oxide – comprise just a tiny fraction of Earth's atmospheric gases Most of the atmosphere (to a height of 25 km) is composed of just two gases nitrogen (78%) and oxygen (21%)CO 2 is an important greenhouse gas, and along with water vapor, keeps the Earth warm enough to support life as we know it But there are many other gases (as well as substances like aerosol particles) that have roles in atmospheric warming and some of them have been emitted into our atmosphere largely as a result of human activity They include methane, nitrous oxide, ozone, and halogenated gases The Gre