If Earth had no greenhouse effect, it would be ________.

Greenhouse gases in the atmosphere make the Earth warmer because they __________ some of the heat that radiates away from Earth’s surface.

If the climate becomes warmer, sea levels will _______

Geologic records provide evidence that Earth _______

Earth’s climate has changed due to ________.

The discovery of fossils of tropical organisms such as palm trees in Antarctica indicates that _________

Which of the following ideas can help explain why Antarctica used to have a much warmer climate than it has now?

The greenhouse effect ________

Global warming is ______.

If the Earth's climate has sometimes naturally been warmer in the past, then why is global warming considered to be a bad thing?

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