An ambitious plan to build a vast forest belt straight across Africa to contain desertification has taken root in Senegal, greening huge tracts of land with drought-tolerant tree species.

African leaders meet to push forward the idea of planting a tree belt - the Great Green Wall - across Africa from west to east.

Citation: Africa's tree belt takes root in Senegal (2011, June 20 ... So what do the world's coastlines look like in 2025? Scientists revisit turn-of-the-century forecasts.