Question

1. which mode of transportation makes the least impact on levels of atmospheric carbon dioxide?

a. carpooling
b. riding a bicycle
c. taking a public bus
d. riding a gas scooter

Explanation:

Carpooling, public buses, and gas scooters all rely on fossil fuel-powered engines (or in the case of buses, often fossil fuels) that emit carbon dioxide. Riding a bicycle is a human-powered mode of transport that produces no direct atmospheric carbon dioxide emissions, so it has the least impact.

Answer:

B. riding a bicycle