Instead of looking for underground hot water deposits, they drill and fracture relatively warm rock.

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In a warm front, a mass of relatively warm air pushes against a block of cooler air and is forced to flow up over it.

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The result is a relatively warm light, between 3, 000 and 4, 000 kelvin, that generates more than twice as many lumens per-watt as Philips' current LED bulbs.

ENGADGET

Yet that is just what is happening in Greenland, whose relatively warm and wet sheet is on course to melt completely, bringing the prospect of a sea-level rise of perhaps seven metres.

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While Moscow said the failure to notify Ashgabat was an accident, Russia simply did not need the gas as European demand was down significantly due to the financial crisis and a relatively warm winter.

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He said unseasonably warm temperatures led to relatively high levels of cedar and elm pollen.

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Meanwhile, the Ohio Valley, Mid-Atlantic and Southeast states should expect unseasonably warm air to linger until late in the week, while it should remain relatively cool in the Northeast and Great Lakes region.

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The Somerset left-hander scored a relatively paltry seven and 21 in his two innings and has just one more three-day warm-up match left in which to improve his form before the first Test.

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Rohit scored 80 off 53 balls in his side's warm-up match against Pakistan but on this occasion he and Gambhir got off to a relatively cautious start in the face of some disciplined bowling and sharp fielding by Bangladesh.

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