1. The greenhouse effect is when many pollutants get stuck in the Earth's atmosphere, thus trapping UV rays and stopping them from reflecting back to space, thus making Earth hotter.
2. The three most common greenhouse gases are flourocarbons, carbon dioxide, and methane.
3. Greenhouse gases are produced when animals exhale and when humans burn coal/oil and when we deforest the earth.
4. Greenhouse gases affect us because they affect our climate.
5. The Greenhouse effect is good when left alone, for if they didn't exist, an ice age might occur. When humans interfer, however, the climate is messed up and that is bad.