article_snippet.sent: Above, a drilling site in Balcombe, West Sussex .
article_snippet.sent: Greenpeace activists 'frack' David Cameron's countryside home last year.
article_snippet.sent: Above, a man puts up a sign on green barriers .
article_snippet.sent: Over 2,000 people marched and surrounded a drill rig by forming a human chain in West Sussex in 2013 .
article_snippet.sent: next month opposition to shale gas organised by Greenpeace and Friends of the Earth.
article_snippet.sent: Environmental activists locked Environmental activists together at the main entrance to the Cuadrilla exploratory drilling site in Balcombe .
article_snippet.sent: A camp in Balcombe was set up to protest against plans to drill  for methane gas on a site just outside the village .
article_snippet.sent: Fracking, or hydraulic fracturing, is a method of extracting natural gas from rock deep underground by blasting rock with a mixture of water, sand and chemicals.
article_snippet.sent: The industry claims The industry is a safe way of solving the energy crisis and produces fewer greenhouse gases than other fuel-production methods.
article_snippet.sent: But campaigners claim the technique poisons water supplies, industrialises the countryside and increases the risk of earthquakes.