I am unapologetic about asking people to connect up their own responsibility for their total environmental footprint and how they decide to procreate and how many children they think are appropriate.

Absolutely love the new campaign from the Optimum Population Trust: do your bit for addressing climate change by having fewer children - or even no children. The lifetime CO2 emissions of a UK citizen amount to 750 tonnes (the equivalent - apparently - of 620 return flights between London and New York), so the extra 10 million by which our population will rise between now and 2074 will, over their lifetimes, emit around 7½ billion tonnes of CO2..."births averted" is probably the most single most substantial and cost-effective intervention that governments could be using

What may be possible for a minority of humankind, albeit at great cost, simply cannot work for the humankind. Our kind of progress depends on lacerating the Earth,on gouging out its riches, on stripping is life-sustaining skin of soil and forest

The World Health Organization recently published some data showing that each overweight person causes and additional one tonne of CO2 to be emitted every year. With one billion people overweight around the world-of whom at least 300 million are obese-that's an additional one billion tonnes.

Keeping people on side is a precondition of making any progress on sustainability issues

The future will be green, or not at all. This truth lies at the heart of humankind's most pressing challenge: to learn to live in harmony with the Earth on a genuinely sustainable basis.

A combination of very rapid population growth over the last 50 years and reckless economic growth during the same time has stored up massive problems for societies the world over. No nation is immune. The scientific evidence tells us all we need to know: carry on with business-as-usual growth-at-all-costs, and we're stuffed