Climate crisis

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Across
  1. 5. Which type of "energy" comes from natural sources like the sun or wind?
  2. 6. Main gas responsible for current global warming
Down
  1. 1. What happens to sea levels as polar ice caps melt
  2. 2. What is the name of the agreement signed in 2015 to limit global temperature rise?
  3. 3. What is a gas that traps heat in the atmosphere called?
  4. 4. In 1938 Guy Callendar made a historic discovery that the planet has ----