What is the major cause of the greenhouse effect?

carbon dioxide in the water

soot from coal plants in the water

soot from coal plants in the atmosphere

carbon dioxide in the atmosphere***
will post answers when done.

2 answers

carbon dioxide in the atmosphere
Monitor the sea level over set period of time.
coal
buying apples from farms that plan to use organic practices
walk to work, carpool to work, drive alone to work
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