In order to cope with global warming, we advocate low-carbon life. In fossil energy, hydropower, wind energy, solar energy and geothermal energy, _ _ will produce carbon emissions.

Fossil energy will emit a lot of carbon dioxide and other gases into the air during combustion, polluting the atmospheric environment, while hydropower, wind energy, solar energy and geothermal energy have no carbon emissions.

Mobile phones are both transmitters and receivers of electromagnetic waves. It uses electromagnetic waves to transmit information.

So, the answer is: fossil energy; ? Electromagnetic waves.