His interest in population dynamics also extended to humans and in 1969 he was the host and editor of a symposium held at the Royal Geographical Society on'The Optimum Population for Britain'with an audience of mainly professional biologists.
12.
He is also a patron of population concern charity Population Matters, ( formerly known as the Optimum Population Trust ), and told BBC Radio 4's " Today " programme that the ideal population for Britain could be around 20 million.
13.
"' Pop " Offsets " "'is a web-based, carbon offsetting project of Population Matters, ( formerly known as the Optimum Population Trust ), a charity devoted to offsetting CO 2 emissions by enabling individuals and organisations to fund rights-based family planning schemes, health programs, relationship and sex education worldwide.
