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Right now they are at 20-year-low, partly as a result of the economic recession, but also as a result of the wide uptake of shale gas.
BBC: Climate change makes late surge in US elections
The seawater down there is so cold that when natural gas bubbles out of the well into the water it forms methane hydrates, which clog the uptake pipe.
FORBES: BP's Big Box Removed From Leak As Gas Crystals Clog Uptake Pipe
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