Question

Plz answer again will give brainlest you just gotta tell me how to do it

Answer 1

Global warming causes increase level CO2

Answer 2

Since it’s negative you automatically know the last two are out.

the first two choices are correct. The last two are talking about how it helps plants which is not a negative effect. The first two are talking about how it limits plants.

Final answer is the first two choices :)