Question

1. what human activity can have the greatest positive change on global climate change by helping to reduce the amount of carbon dioxide in the atmosphere?

a. building homes out of metal instead of wood
b. recycling plastics
c. limiting engines that use fossil fuels for energy
d. using alternatives to chlorofluorocarbons (cfcs) for refrigeration

Explanation:

Fossil fuel combustion is the largest human-caused source of atmospheric carbon dioxide, a primary greenhouse gas driving global climate change. Limiting fossil fuel-powered engines directly cuts this major CO₂ emission source, having a far larger positive impact on reducing atmospheric CO₂ compared to the other options (which target smaller, indirect, or unrelated climate factors).

Answer:

c. limiting engines that use fossil fuels for energy