This story made the papers and TV in the middle of June. It concerned the installation by Sainsbury's in Gloucester of a device in their car park to recover energy as cars passed over it. The energy could then be used to help power their store tills.
This was explained to be very "green" and therefore good for the planet.
Most interesting to me was the fact that the site linked above, the Green Optimist, was probably one of the few that seems to have had no comments pointing out the big error with this story.
As you can see if you scroll down and read the comments on these pages :
There is nothing "green" about this at all. The energy is "stolen" from the cars which for the most part will be powered by petrol (or diesel).
How can you avoid being taken in by such stories?
Learn some science.
And don't listen to celebrities - at least, not when they're talking about something important.