Answer:
(2) Fossil fuel combustion creates smog and acid precipitation.
(4) Fossil fuels are far cheaper than renewables.
Explanation:
The fact that renewables are not utilized to the extent they should can have very negative consequences on our environment and our lives. One negative effect of this is the fact that we continue to use fossil fuels due to the lack of an alternative. Because of this, fossil fuels continue creating smog and acid precipitation. Another negative consequence is the fact that, because renewables are not demanded, there is little competition among providers, which means that prices remain high, and fossil fuels continue to be far cheaper than renewables.