2. Energy, a key industrial item
The industry has been using :
HEAT;
mechanical force ;
fuels as raw materials for process inputs (up to 10% of total fuels, e.g. natural gas for fertilizer production);
energy contained in liquid, gaseous, solid or thermal waste ("waste heat").
This last category includes the distribution of coal residues to coal company employees at the beginning of the 20th century. XXhe century... The oldest man-made fire has been identified in Zhoukoudian,...
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Energy, a key industrial item