...the core values that underpin sustainable development - interdependence, empathy, equity, personal responsibility and intergenerational justice - are the only foundation upon which any viable vision of a better world can possibly be constructed

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.

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.

If something is sustainable, it means we can go on doing it indefinitely. If it isn't, we can't

I think we will work our way towards a position that says that having more than two children is irresponsible.

Many ideas have struggled over the centuries to dominate the planet. Fascism. Communism. Democracy. Religion. But only one has achieved total supremacy. Its compulsive attractions rob its followers of reason and good sense. It has created unsustainable inequalities and threatened to tear apart the very fabric of society. More powerful than any religion, it has reached into every corner of the globe. It is consumerism

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