Using plants to feed our fuel needs may be a great idea, and the biofuel goldrush could be a moneyspinner for several poor countries, but some experts warn people may go hungry as food prices rise. Fans of biofuels give the impression we could soon be running cars on maize, producing electricity with sugar, and getting power from palm oil.

Aid workers in risky environments may fear violence but they are more likely to die — and hurt the people they are trying to help — in a car crash, logistics experts say. These specialists are joining a growing initiative to make humanitarian groups more responsible with their gas-guzzling four-wheel-drive cars..