fracking

• fracking is a technique for recovering gas and oil from shale rock by injecting water, sand and chemicals under high pressure

  
• shale reserves are typically distributed horizontally rather than vertically

  
• economic advantage: new jobs are created to manage the process

  
• economic advantage: its cheap to run and gain energy

  
• environmental advantage: it produces less carbon dioxide than coal and oil

  
• environmental disadvantage: the use of chemicals can cause pollution
• environmental disadvantage: high consumption of water is needed for fracking
• environmental disadvantage: it generates lots of contaminated sludge that needs to be treated