By including such data in their computer simulations, climate modellers may be able to tell whether solar inconstancy deserves some of the blame heaped on greenhouse gases.

ECONOMIST: Global warming: In flux | The

At the same time, consumers got an extra bill to support wind farms that, because of the inconstancy of the wind, operate at 25% of their capacity (figure from the British Wind Energy Association) or 8% (according to E.on, a large operator of UK wind farms).

FORBES: The Great Green Energy Crack-Up