TechnologySolar-cell thread heralds promise of wearable chargers Fibres containing a mineral called perovskite have been woven into cloth that acts as a solar cell 51¶¯Âþ
EarthEmissions pledges trickle in for UN climate deal Several big carbon emitters, including the EU and US, have filed plans for cutting emissions ahead of a UN deadline in the run-up to the Paris climate summit 51¶¯Âþ