逆运算

　　（本片中文字幕由 光合作用字幕组 制作） 　　Toby Buckland explores the use of peat and its alternatives in gardening. The government has a target that growing media should be 90 per cent peat-free by 2010. Toby talks to gardeners who are passionate about using the material, and also meets the environmentalists who campaign for preserving peat bogs.