Global CO2

Global warming is caused by the buildup of greenhouse gasses in the atmosphere which keep the sun’s heat from escaping. Light from the sun, which is what heats the Earth, comes down to Earth and reflected off, but instead of going back through the atmosphere, it gets absorbed by greenhouse gases. Around 90% of the light from the sun is absorbed by these gases such as water vapor, nitrous oxide, methane and carbon dioxide. Global warming is occurring because greenhouse gas levels are continuously increasing, in a large part because of humans. In the last 150 years’ humans went through an industrial revolution that has significantly increased the release of greenhouse gases. Just within this time, carbon dioxide levels have increased from 280 ppm to 400 ppm.