Coal emits the most pollution. It emits more carbon dioxide (CO2) and other pollutants like nitrogen oxides, sulfur oxides, Mercury, traces of other metals and fly ash than either oil or natural gas.
Coal is the most polluting, then oil, then natural gas.
For all intents and purpose Solar energy is a renewable resource. It is there for us to harvest and its use by us wil not diminish the supply.
Coal is the most used source for electricity in the US. World wide, other countries, I don't know.
The internet was not used as a source for the US constitution.
No, coal is.
Its coal and hydrogen
The most important source of political power for the US government is the people.
All of it
Coal
most likely, it's coal
most likely, it's coal
Coal is used as a source of power in all 50 US states. It is the main source of electric power in the US acconting for ~43%.
Propane pollutes the air around us. Propane is used as fuel and in chemical synthesis. Also propane is a nonrenewable gas.