Environmental Science
Carbon dioxide is called greenhouse gas because it is

Transparent to both sunlight and heat
Transparent to sunlight but traps heat
Used in green-house to increase plant growth
Transparent to heat but traps sunlight

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Environmental Science
The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?

Low albedo of clouds, high albedo of water
High albedo of clouds, low albedo of water
Low albedo of clouds, low albedo of water
High albedo of clouds, high albedo of water

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