Environmental Science
Ecology is

The science that studies the evolution of life,
The study of the relationships between organisms and their environment
Integrates both social and natural sciences to help us understand how the earth works,
The study of the environment in the absence of humans

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Environmental Science
At night, low clouds:

Have no effect on the atmospheric greenhouse effect
Weaken the atmospheric greenhouse effect
Are often caused by the atmospheric greenhouse effect
Enhance the atmospheric greenhouse effect

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