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  1. 3. a prolonged period of abnormally low rainfall
  2. 7. converting waste into reusable material
  3. 8. a condition where the number of existing human population exceeds the carrying capacity of the Earth
  4. 9. capable of being decomposed by bacteria or other living organisms
  5. 10. a type of air pollution
  6. 11. the amount of carbon dioxide released into the atmosphere as a result of the activities of a particular individual, organization, or community
  7. 13. a natural resource or source of energy that is not depleted by use, such as water, wind, or solar power
  8. 14. the gases that can trap heat
  9. 16. an area of land with a group of energy-producing windmills or wind turbines
  10. 18. a region of the Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation
  11. 19. a rain or any other form of precipitation that has elevated levels of hydrogen ions (low pH)
  1. 1. a gradual increase in the overall temperature of the Earth's atmosphere
  2. 2. a species of animal or plant that is seriously at risk of extinction
  3. 4. the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity
  4. 5. the process of replanting an area with trees
  5. 6. a colorless gas that people and animals release when they breathe out
  6. 12. chemical compounds that are used to kill insects, rodents, fungi and unwanted plants
  7. 15. the sun is the main source of ... rays
  8. 17. a vehicle that combines two or more sources of power