Match the following terms. Terms:
1. greenhouse gases
2. carbon cycle
3. global warming
4. carbon footprint
5. acid rain

Definitions:
• rainwater that has a pH lower than normal.
• components of the air mixture that trap infrared energy.
• an overall increase in world temperatures attributed to increased concentrations of greenhouse gases.
• physical processes and chemical reactions that move carbon through the biosphere and geosphere.
• a calculation that determines how much green house has an individual generates.