Read the two passages. We have to slow down the emissions of carbon dioxide. . . . And the best [ways] to do that are energy efficiency and a switch to renewables.

–Ramez Naam,
Quoted in "The Trillion Dollar Crisis Facing the U. S.,”
Bernice Napach

The Environmental Protection Agency says that energy efficiency can reduce carbon dioxide emissions at a relatively low cost.

"Energy Efficiency as a Low-Cost Resource for Achieving Carbon Emissions Reductions,”
Environmental Protection Agency

What idea about carbon dioxide emissions do both passages support?

The creation of carbon dioxide is mainly caused by burning coal and oil.
Energy efficiency is a good way to reduce the creation of carbon dioxide.
Switching to renewable energy will reduce the amount of carbon dioxide created.
Energy efficiency is an affordable way to reduce emissions.