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We all worry about the population explosion, but we don't worry about it at the right time.

The human overpopulation issue is the topic I see as the most vital to solve if our children and grandchildren are to have a good quality of life.

We have access to practical, ethical and scientifically established methods of birth control. So I think that is the most ethical way to reduce our population.

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

If you want this planet to continue being habitable for everyone that lives here, you have to limit the number of inhabitants. Hunters do it by killing off the old or sick animals in a herd, but I don't think that's a very ethical way of limiting the population.

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.

When you destroy a population, once femicide happens, we're going to see the end of humanity, because I don't know how you sustain a future without vitalised women.

We are not overpopulated in an absolute sense; we've got the technology for 10 billion, probably 15 billion people, to live on this planet and live good lives. What we haven't done is developed our technology.

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.

Our planet's lands and oceans are already stretched to meet the demands of 7 billion people. The human population continues to grow. The search for sustainable solutions is an economic and a moral imperative if we are to create the future we want.