According to report

 
Last Updated: Saturday 04 July 2015 | 02:50:09 AM

black fortune: China's reliance on cheap coal to fuel its economy cost US $248 billion in 2007 through damage to the environment, strain on the healthcare system and manipulation of the commodity's price, said a report released by Greenpeace. Coal accounts for 70 per cent of the country's energy use but its supplies have been strained.

it's four times: A greenhouse gas, nitrogen trifluoride is four times more prevalent in the atmosphere than previously thought. Using new analytical techniques, scientists at the University of California in the US have found that about 5,400 tonnes of nitrogen trifluoride is present in the atmosphere and is increasing at the rate of 11 per cent a year. In 2006, its amount was estimated to be less than 1,200 tonnes. Regulating the emissions of the gas is important because it is 17,000 times more potent as a warming agent than CO2, said the scientists.

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