Components of the Atmosphere

methane

less than 1% of the atmosphere contributes to the greenhouse effect has increased due to fossil fuels, coal mining, grazing animals, flooding of rice fields average cycle is 10 years

carbon dioxide

less than 1% of the atmosphere increased by 25% in the last 300 years due to burning fossil fuels and deforestation produced during cellular respiration and decaying organic material major greenhouse gas

nitrous oxide

less than 1% of the atmosphere increasing by .3% every year sources include burning fossil fuels, fertilizers, burning biomass, deforestation, and conversion to agricultural land Single most important contributor to the destruction of the ozone layer

ozone

less than 1% of the atmosphere mostly found in the stratosphere produced during the production of photo-chemical smog CFCs break it down

water vapor

0-4% of the atmosphere

oxygen

21% of the atmosphere

nitrogen

78% of the atmosphere

CFCs

the primary cause of the breakdown of the ozone layer