Which of the following would reduce air pollution on Earth?

Question

a. Making sure every house has a garden.
b. Building houses out of composite wood materials instead of natural wood.
c. Changing away from using planes to ship cargo to using ships.
d. Planting trees and reducing carbon emissions.

Answer 1

c. Changing away from using planes to ship cargo to using ships.
d. Planting trees and reducing carbon emissions.