EarthTrade war looms over Europe's aircraft carbon tax The world could be on the brink of a trade war over European Union efforts to impose carbon charges on the emissions of all planes landing or taking off within the EU 51¶¯Âþ
EarthCurrent power: New tide turbines tap oceans of energy The huge potential of ocean currents could at last be tapped, thanks to the latest generators now being trialled on the seabed. Fred Pearce reports Features