Despite the Lack of Federal Government Action, in 2011

Despite the lack of federal government action, in 2011

A) CO2 emissions in the United States were down due to newer fuel-efficient cars.
B) CO2 emissions in the United States were down due to newer power plants coming on line that used natural gas instead of coal.
C) CO2 emissions in the United States were down due to tougher emissions laws passed by states.
D) CO2 emissions in the United States were down due to a colder winter.
E) Options A and B are true.