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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.

On climate change, we often don't fully appreciate that it is a problem. We think it is a problem waiting to happen.

There are plenty of problems in the world, many of them interconnected. But there is no problem which compares with this central, universal problem of saving the human race from extinction.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

I think the biggest problem in the world is that we have a generation of young people, and maybe two, who don't think it's going to get any better.

Most of us feel some kind of uncertainty, with the population increasing and resources decreasing. We have to face these issues.

There isn't a more important issue in the world than global warming. Even the Cold War and the Bay of Pigs crisis were a notional threat.

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.

In the years to come, the combination of climate change and population growth could have a devastating effect on the planet and, needless to say, on humanity.