The Greenhouse Effect, Which Has Become a Major Ecological Concern

Multiple Choice

The greenhouse effect, which has become a major ecological concern, is caused by

A) the release of heat energy from burning fossil fuels.
B) overuse of fertilizers in farming.
C) global warming.
D) the destruction of ozone in the upper atmosphere.
E) the increase in atmospheric concentrations of greenhouse gases (CO2,CH4, and N2O) .