Guardian: The new Honda Insight is not shy about publicising its green credentials. It shouts them from the rooftops – make that the treetops, the tops of the trees that will live so much longer because you have bought one of these cars instead of a filthy gas-guzzler. The little booklet that tells me all about the car is covered in paper that has seeds embedded in it. Presumably, when I have finished reading it, I will toss it into an urban wasteland and a meadow will spring up, and we Insight …