Earth Day: Planet

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Across
  1. 3. long-term shifts in temperatures and weather patterns
  2. 6. the most-emitted type of greenhouse gas
  3. 7. a community of living things interacting with their environment
  4. 8. the planet we live on
  5. 9. the variety of living species on our planet
Down
  1. 1. term describing species with a high risk of going extinct
  2. 2. the process of planting new trees in degraded areas
  3. 4. 9.1 billion tons of this material have been produced since it was introduced in the 1950s
  4. 5. geothermal, solar, and hydropower are examples of this type of energy