Question

why do renewable energy sources help reduce global warming?
○ they emit fewer greenhouse gases than fossil fuels.
○ they are more expensive to use.
○ they destroy ozone faster.
○ they require more technology.

Explanation:

Renewable energy sources (like solar, wind) produce fewer greenhouse gases (GHGs) than fossil fuels (coal, oil, gas). GHGs trap heat, causing global warming. So using renewables reduces GHG emissions, helping mitigate global warming. The other options are incorrect: renewables can be cost - effective long - term, don't destroy ozone (ozone depletion is from CFCs, not energy sources), and while some tech is needed, the key climate benefit is low GHG emissions.

Answer:

The option "They emit fewer greenhouse gases than fossil fuels."