Guardian: David Attenborough has assumed his position as a patron of the Optimum Population Trust with some strict remarks about population growth. “There are three times as many people in the world as when I started making television programmes only a mere 56 years ago,” he said. “It is frightening. We can’t go on as we have been. We are seeing the consequences in terms of ecology, atmospheric pollution and in terms of the space and food production.” Like so many areas of green debate, this is …