| A | B |
|---|
| release of gaseous chemicals that can form acids in the atmosphere | acid rain |
| caused by both point and non-point sources | water pollution |
| introduction of non-native species to an environment | invasive species |
| interaction of chlorofluorocarbons | ozone depletion |
| Results in desertification and erosion | deforestation |
| toxins concentrate higher up the food chain | biomagnification |
| climate change | caused by greenhouse effect |
| treaty to control depletion of the ozone layer | Montreal Protocol |
| nitrogen fixing | required for plants to use nitrogen in atmosphere |
