A human activity that could significantly decrease

the amount of carbon dioxide in the air is

(1) increasing the use of fossil fuel

(2) controlling insect pests that eat stored grain

(3) burning garbage and trash to generate

electricity

(4) preserving and expanding forest habitats that

shelter wildlife

Verified Answer :

(4) preserving and expanding forest habitats that
shelter wildlife. Because plants use carbon dioxide and give out oxygen so the CO2 in the atmosphere will decrease.