Environmentalists meeting in Nairobi say the trade in biofuels should be governed by environmental standards, and warn that planting crops solely for biofuels may cause catastrophic damage to the planet. Speaking at the UN Environment Programme (UNEP) Governing Council meeting held in Nairobi yesterday (5 February), Danish environment minister Connie Hedegaard said that environmental standards were vital if the international trade in biofuels was to be allowed to begin on a massive scale.