You can heat your home decently with oil or gas, too.
And you can heat up our atmosphere as well.

If you compare their primary energy consumption and their CO₂ emissions, heat pump heating systems are clearly superior to gas or oil heating systems. 

In the interest of comprehensive climate control, heat pumps significantly reduce the pollutant emissions of carbon dioxide (CO₂), sulphur dioxide, nitrogen and dust. They therefore pollute the atmosphere far less than gas or oil heating systems.

The average oil heating system in a detached house with a low-temperature heating system produces, for example, more than twice the amount of CO2 than a heat pump system would. A comparable gas heating system produces more than 1.5 times as much. For a detached house with 150m² of living space and a heat consumption of 7.5 kW, this corresponds to a savings of 1,150 kg of CO2 per year or 3,770 kg of CO2 per year when using a heat pump.