1. The Human Factor

2. Greenhouse Effect
The greenhouse effect is the retention of heat by the Earth’s atmosphere
Without this life could not exist on Earth
Scientists believe that the greenhouse effect can be increased or decreased by changing some atmospheric gases like carbon dioxide
Some of this could lead to global warming

4. Global Warming Temps worldwide have increased over the last 200 years
If this continues, polar ice caps will continue to melt and oceans rise

9. Impacts of Human Activities
Car exhaust and deforestation play roles in global warming