EarthGreen machine: Trees may spell trouble for wind power Burgeoning forests not only keep CO2 levels in check, they also cut wind speeds – with unfortunate effects for energy generation 51¶¯Âþ
TechnologyGreen machine: Plug-free electric cars' hidden cost The convenience of powering electric cars wirelessly comes at a price – energy losses may mean they have a bigger carbon footprint than some diesels 51¶¯Âþ