Now whether clean coal will be too expensive to use no one really knows yet.
There is no free lunch whether with coal mining or deep-water drilling, or for those who are honest, in the enormous underlying mining and chemical infrastructure needed to build vast arrays of wind and solar farms.
FORBES: Post Fukushima-- burn more coal and oil, and hire more engineers not regulators
Last year, Mr. Choudhury, the company's chairman, said fear of probes into alleged wrongdoing was slowing decision-making at NTPC over operational issues, including whether to buy overseas coal blocks to reduce supply deficits.
Our estimate of future coal production depends a lot on whether we think that the people of Montana will get into serious coal production.
Plans by a UK energy company to test whether gas can be extracted from coal beds near Keynsham has prompted residents to hold a public meeting.
BBC: Meeting over Keynsham gas extraction plan by UK Methane
Whether you look at natural gas, coal, or precious metals, there is a multitude of these examples of imbalances.
So I know that there's some skepticism about whether there is such a thing as clean coal technology.
All utilities that own and operate coal-fired fleets must decide whether to retire or to retrofit their aging plants, many of which were built in the 1950s.
Wales reporter Sally Davies examines the current Welsh farming crisis and whether it has similarities with the demise of the coal industry.
For Glenstrata it is whether the rise in price and increases in demand for copper, iron and coal and all those other feedstocks of the still fast-growing Chinese economy can go on forever.
At Cornell, for example, researchers have reached opposite conclusions on whether natural gas from fracking would be better or worse for climate change than burning coal.
Abdul Rehman Shahid, a member of parliament from Bamiyan Province, couldn't confirm whether children worked in those mines, but added that the government recently enforced a ban on transporting coal there.
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