Over time, the extra work and pressure can stiffen blood vessels, leading to high blood pressure, heart attack, and stroke. It can also lead to heart failure. There is also some evidence that too much salt can damage the heart, aorta, and kidneys without increasing blood pressure, and that it may be bad for bones, too. High blood pressure is a leading cause of cardiovascular disease.
CMM is a mixture of methane & air released during the process of coal mining and must be vented for safety reasons. Methane has significant effects as a greenhouse gas being 21 times higher than that of carbon dioxide, therefore its capture and use in gas engines has significant environmental benefits.
Cons. 1  Coal is nonrenewable. 2  There is a finite supply. 3  Coal contains the most CO2 per BTU, the largest contributor to global warming. 4  Severe environmental, social and health and safety impacts of coal mining. 5  Devastation of environment around coal mines.ons. 1  Coal is nonrenewable. 2  Coal contains the most CO2 per BTU, the largest contributor to global warming. 3  Severe environmental, social and health and safety impacts of coal mining. 4  Devastation of environment around coal mines.