BusinessGreen.com Most Read - 21 August

Blacklight gains academic nod for controversial hydrogen technology

Company touts third-party verification for its potentially revolutionary hydrino-based energy source

Greenpeace uncovers "astroturf" campaign to challenge US climate bill

Leaked email reveals that American Petroleum Institute is planning a series of rallies to protest against Waxman-Markey bill

Obama's new UK ambassador blots green record in Congestion Charge row

Washington confirms it will not reverse policy of refusing to pay for " congestion tax", despite owing more than £3.4m in unpaid fines

London turns 3,500 traffic lights "green"

LED lights to be installed at 300 junctions across the capital

China and India accuse West of ignoring climate science

Chinese negotiator voices "unhappiness" at rich nations' reluctance to sign up to ambitious emissions targets

GM starts work on $43m Volt battery plant

Car manufacturer planning to become first US auto giant to operate its own electric car battery plant

Report warns high-speed rail may not be low carbon

Government-commissioned study calculates that carbon emissions resulting from building and operating high-speed rail link mean domestic flights could be greener on some routes

LAX inks 1.5 million gallon biofuel deal

Synthetic biodiesel to be used by ground vehicles, but supplier confident it can also serve aviation market

Cadbury New Zealand to revert to palm oil-free chocolate production

U-turn comes as study reveals palm plantations store less carbon than previous estimates

Australian solar-powered air con uses sun to beat the heat

Federal grant to help achieve commercial launch by 2011