Which conclusion was considered "very likely" in the 2007 report of the Intergovernmental Panel on Climate Change?
A) Human-caused emissions are the main factor causing warming since 1950.
B) The observed warming of the past 100 years is due solely to climate variability.
C) The Arctic Sea ice thickness decreased approximately 40% during late summer/early fall.
D) Summer droughts have increaseD.
Correct Answer:
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