Eighteen fifty-eight was a year of great technological advancement in the West. That was the year when Queen Victoria was able, for the first time, to communicate with President Buchanan, through the Transatlantic Telegraphic Cable. And they were the first to ‘Twitter’ transatlantically.

You don't have to get rich to have [fewer] children. It has happened across the world.

I have a motto: it's never too late to give up. It's never too late to give up what you are doing, and start doing what you realise you love.

We must obviously be much more clever in using resources, regulate with tax and promote innovations.

The number of children is not growing any longer in the world. We are still debating peak oil, but we have definitely reached peak child.

Half of the energy is used by one seventh of the world's population.

I have shown that Swedish top students know statistically significantly less about the world than the chimpanzees.