Jawaban:

1.If the earth did not have atmosphere, what would happen?

The Earth would be much colder.

2.What thing does keep the earth's climate livable?

The greenhouse effect.

3.Mention the causes of the green house effect enhancement based on the textt!..

Humans can enhance the greenhouse effects by making carbon dioxide, a greenhouse gas, through the burning of fossil fuels and other GHG emissions.

4."...but they have been fairly constant for the past few thousand years." (last paragraph). What does  the word they in the sentence refer to? ....

It refers to Levels of Greenhouse Gases (GHGs).

5."..when certain gases in Earth's atmosphere trap heat."

What is the antonym of the underlined word?...​

Penjelasan:

Untuk nomor 5. kata mana yang digarisbawahi (underlined word) ya kak?

Semoga membantu ya.