Economist: THE summer dry-season, now drawing to an end, is when the Amazon rainforest gets cut and burned. The smoke this causes can often be seen from space. But not this year. Brazil’s deforestation rate has dropped astoundingly fast. In 2004 some 2.8m hectares (10,700 square miles) of the Amazon were razed; last year only around 750,000 hectares were. This progress is not isolated. Many of the world’s biggest clearers of trees have started to hug them. Over the past decade, the UN records, …