Nowhere is the greenhouse effect more noticeable than inside a car on a hot day. But the new Toyota Prius comes with new green technologies including cooling fans run by optional solar panels on the roof. Even when the car is off and locked, these fans whir around, so when you step back into it you don't need to crank up the power-hungry air conditioning. And the air-con system on the 2010 Prius (which confusingly was released in Japan last month and is due for release in the UK on 1 August) is more efficient to boot. Toyota Prius revamped with solar power roof | Environment | guardian.co.uk
