Energy is both heat and electrical power source is coal, natural gas, fuel oil, There is limited and there are still environmental toxicity. And destroy the atmosphere of the air as well.
A power consumption, heat and electric power source is coal oil. Kat nature. Fuel unless it is limited, there is still the problem of environmental toxicity. Floor pattern and nice weather.
The power consumption and heat and electric power source is coal oil natural gas QC in addition to a limited environment, there is still a problem and destroy toxic air and floor mount.