An anti-fracking and climate protesters hold placards during a rally at the former test drill site operated by British energy firm Cuadrilla Resources in Balcombe, southern England, on January 19, 2014. Cameron earlier this week promised local authorities all of the tax yields from fracking sites in a bid to boost support for the controversial technique to reach previously unreachable sources of gas. Fracking involves using huge amounts of pressurised water mixed with chemicals to crack open shale -- sedimentary rock containing hydrocarbons -- to release natural gas. Campaigners opposed to the technique cite fears over water contamination, air pollution and the effect of extracting more hydrocarbons for fuel could have on global warming and climate change. AFP PHOTO/BEN STANSALL (Photo credit should read BEN STANSALL/AFP/Getty Images)
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