People and Planet: Global warming threatens to destroy the snow capped glaciers on Mount Kilimanjaro in East Africa, and reduce the regular water supply on which the region’s farmers depend, within 20 years. Deforestion could make the problem worse. But in the last few years a Tanzanian botanist has developed a tree planting project that has seen nearly 2 million tree seedlings planted by school children, and new laws passed to conserve the region’s trees. This specially commissioned report, by Kenyan …