Question

several atmospheric gases contribute to climate change: carbon dioxide, methane, and nitrous oxide. considering this, which choice would do the least to directly reduce atmospheric carbon dioxide.
a the widespread use of carpooling and public transportation.
b the reforestation of large areas of amazon wilderness in brazil.
c discontinued use of coal power plants, in favor of nuclear plants.
d the conversion of restaurant grease to bio - diesel fuel for use by motorists.

Explanation:

To determine which option least directly reduces atmospheric CO₂, analyze each:

• Option A: Carpooling/public transport reduces fossil fuel use (less CO₂ from vehicles).
• Option B: Reforestation (trees absorb CO₂ via photosynthesis) directly reduces atmospheric CO₂.
• Option C: Discontinuing coal plants (high CO₂ emitters) in favor of nuclear (low CO₂) reduces CO₂ from energy production.
• Option D: Converting restaurant grease to bio - diesel for motorists: Bio - diesel production/use has complex CO₂ impacts (e.g., grease is a waste, but bio - diesel still burns, and the process may not drastically cut CO₂ compared to the other options. It focuses on fuel source for vehicles rather than direct CO₂ reduction like reforestation, energy - plant changes, or reduced vehicle emissions from carpooling).

So, D has the least direct impact on reducing atmospheric CO₂.

Answer:

D. the conversion of restaurant grease to bio - diesel fuel for use by motorists.