Answer
(c)
Work Step by Step
This statement is not entirely accurate. While it is true that the switch from coal to natural gas has resulted in a reduction of carbon emissions per unit of energy produced, the overall total carbon emissions in the United States have not decreased significantly over the past two decades. The use of natural gas has increased, but so has energy demand, leading to a relatively stable level of total carbon emissions. Additionally, other factors, such as the growth of renewable energy sources and improvements in energy efficiency, have also influenced carbon emission trends in the United States.
The answer is (c).
