And now for an idea from left field.

Lots of people complain about the environmental destruction caused by coal mining and CO2 pollution. A million trees (sic) are turned into reports on all the associated problems.

So why not consider a market based approach to the problem.

Deal of the century: buy out the US coal industry for $50bn
What if Bloomberg, Branson and Grantham came together to buy out the coal industry, close and clean up the mines, retrain workers and accelerate the expansion of renewable energy?

Felix Kramer and Gil Friend
Guardian Professional, Wednesday 12 March 2014 04.00 AEST
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Would you make a one time $50 (31) investment to save $100-500 each year? Sound good? Add nine zeros to each of those numbers. In other words, invest $50bn once over the next decade, and generate $100-$500bn in benefits every year.

That's the surprisingly low price to buy up and shut down all the private and public coal companies in the US, breaking the centuries-old grip of an obsolete, destructive technology that threatens our present and our future. It's a compelling high-return opportunity available now in the US if some farsighted investors merge purpose and private equity in a new way.

How would it work? The deal would phase out coal companies over 10 years, close and clean up the mines, write down the assets, retrain and re-employ some 87,000 workers, and create job opportunities and prosperity for coal-based communities. If at the same time the US accelerates expansion of renewable energy sources and transmission facilities, this could be accomplished with no interruption to electricity supplies, adding only about a penny or two to each kilowatt-hour on electricity bills.

This one-time transaction would generate multiple benefits. It would eliminate US's largest single source of greenhouse gases: carbon dioxide from coal plants. What's it worth to cut out at least one quarter of US carbon emissions? To assign a dollar value, we'd need to put a price on carbon.

Even without that number, though, we can already tally the direct health and environmental benefits of ending coal: the sulphur dioxide that causes acid rain, the nitrogen oxide that becomes smog, the particulates that provoke asthma, and the toxins like mercury, lead and cadmium that harm human brains, animals and fish. Estimates range from $100bn a year in a 2010 National Academy of Sciences report to $345bn a year in a 2011 Harvard Medical School study.

Thoughts ? (Reading the whole story might be useful .)