Chopping down trees with an ax in the backyard Collecting fall leaves Cutting grass with a gas-powered lawnmower Picking colorful wildflowers along the highway
I gave my students this multiple choice question: Which of these does the MOST harm to the air?

Only one answer is correct among these 4 choices:
- Chopping down trees with an ax in the backyard
- Collecting fall leaves
- Cutting grass with a gas-powered lawnmower
- Picking colorful wildflowers along the highway

Could you tell me which one is correct?

Cutting grass with a gas-powered lawnmower