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Correct Answer: D) 3.
Correct Answer: C) Polar climate.
Correct Answer: C) Wider annual rings imply warmer, wetter years.
Correct Answer: A) The biggest reason people burn fossil fuels is for cars and other types of transportation.
Correct Answer: A) They trap it in the atmosphere.
Correct Answer: C) Coal-burning factories.
Correct Answer: C) Risen & fallen some years, but overall increased.
Correct Answer: C) Falls.
Correct Answer: B) Electricity and heat energy.
Correct Answer: D) The sun heats air and water more at the equator because it receives more direct sunlight.
Correct Answer: B) An interglacial period within an ice age.
Correct Answer: B) More humid.
Correct Answer: B) Photosynthesis.
Correct Answer: C) Kyoto Protocol.
Correct Answer: B) 4 inches-several yards.
Correct Answer: B) Air gets thinner.
Correct Answer: D) True.
Correct Answer: D) Less than 1%.
Correct Answer: D) A Human-Caused Increase in Greenhouse Gases.
Correct Answer: C) Continental climate.
Correct Answer: D) Increase the temperature of the earth.
Correct Answer: B) Deforestation.
Correct Answer: D) Afforestation.
Correct Answer: B) 97%.
Correct Answer: B) Cutting down trees means there is less carbon being absorbed.