You all are nerds suck eggs
see i was thinking that too
excellent. you might mention why the tree organic matter accumulated in massive quantities, and why atmospheric CO2 levels decreased, over millions of years -- the white rot fungi connection
Coal is extracted from the ground by coal mining, either underground by shaft mining, or at ground level by open pit mining extraction.
Coal is primarily used as a solid fuel to produce electricity and heat through combustion. World coal consumption was about 7.25 billion tonnes in 2010
The price of coal increased from around $30.00 per short ton in 2000 to around $150.00 per short ton as of September 2008.
In early 2015, it was trading near $56/ton.