"There is no shortage of oil shale, much of it in the US and Canada, but it must be dug out by strip mining and heated to 450-500°C before being enriched with hydrogen from steam to separate the oil. The resulting sludge, which has increased in volume by 30%, must then be disposed of. The process is said to emit four times as much CO2 as traditional oil production. It also requires large amounts of water."
-The Guardian, Friday 2 June, 2006-
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