Living Environment Regents Practice Test

Which human activity most directly causes a significant increase in the amount of carbon dioxide in the atmosphere?

1. Driving cars long distances

2. Reducing waste

3. Planting trees

4. Using public transportation

The correct answer is: Driving cars long distances

Driving cars long distances contributes significantly to the increase of carbon dioxide in the atmosphere because combustion engines burn fossil fuels such as gasoline or diesel. This process releases carbon dioxide as a byproduct. With the number of vehicles on the road and the reliance on personal automobiles for transportation, especially over long distances, the volume of carbon dioxide emissions becomes substantial. This human activity has a direct impact on climate change, as increased carbon dioxide levels enhance the greenhouse effect, leading to global warming. In contrast, reducing waste, planting trees, and using public transportation are actions that either minimize carbon emissions or actively help mitigate environmental impact. Reducing waste can decrease the energy consumption associated with producing new materials, while planting trees can absorb carbon dioxide. Public transportation, though it may still produce emissions, typically results in lower emissions per person compared to each individual driving their own car for the same distance.