This Thursday at 1pm, George Monbiot turns his attention to the subject of 'green cars'. Join the UK's leading environment commentator for a live web chat to answer your questions on the subject, from the launch of the Tata Nano and Honda's 'affordable' hybrid to Lord Peter Mandelson's plans to pay car-owners to trade in old cars for new ones.
Can hypermiling significantly cut emissions from today's cars? What hope is there for electric cars going mainstream by 2020? Are EU plans for fuel economy stringent enough? And are green cars just an oxymoron?
Get the debate started by posting your questions in the comments below.
See you here on Thursday at 1pm.