But here's a summary:
1) Water quality and quantity - Coalbed methane is loosely bound to coal deposits by groundwater, so massive amounts of water are pumped out to allow the methane out. The water that is pumped out can permanently damage surface soil with sodium, making it unsuitable for agriculture or natural vegetation. Water tables used for human drinking water can be dramatically lowered by this process as well. Also, hydraulic "fracturing fluids" injected into coalbeds to help release methane may cause permanent damage to drinking water.
The water issues associated with CBM are very similar to those of mountain top coal removal in West Virginia.
2) Noise pollution - The noise produced by truck traffic, heavy equipment, seismic explosions, drilling rigs, motors that power pumps, and gas compressors can make life intolerable for anyone living near a CBM operation. The roar emanating from a nearby pump operating 24/7/365 led a rancher in Wyoming to fire several rifle rounds into the rig before he was arrested.
3) Danger - Combustion of 'dewatered' coalbeds can occur due to lightning or range fires. Explosive levels of hydrogen sulfide and methane have been found under buildings and inside homes.
4) Decline in Property Values, as much as 22% in one study done in LaPlata County, Colorado.
more here ==>>
http://www.powderriverbasin.org/cbm/general_background_cbm.shtmlhttp://www.energyjustice.net/naturalgas/cbm/