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I do not believe you can have infinite population or economic growth in a finite world. We are living on the shoulders of some awesome geometric curves.

We used to live in a world where the price of resources came down steadily, and now the world has changed. You have a great mismatch between finite resources and exponential population growth.

The good news is world population growth rate decreases systematically and is expected to reach zero by 2050, thanks to urbanisation and women's education.

In a finite world this means that the per capita share of the world's goods must steadily decrease.

We need to continue to decrease the growth rate of the global population; the planet can't support many more people.

I meet so many that think population growth is a major problem in regard to climate change. But the number of children born per year in the world has stopped growing since 1990. The total number of children below 15 years of age in the world are now relatively stable around 2 billion.

Growth is never by mere chance; it is the result of forces working together.

Sometimes, we use the term 'growth' as a number and sometimes as an abstraction, but the underlying implication is always that, if the country grows at a certain rate, at the end there will be a pot of gold for everyone.

When I was born, the world's population was 3.5 billion. There are now 6.8 billion people on the planet. By 2050, that's expected to rise to 9.4 billion. What's more, the Earth's resources aren't growing; they're decreasing - and rapidly.