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It's obvious that the key problem facing humanity in the coming century is how to bring a better quality of life - for 8 billion or more people - without wrecking the environment entirely in the attempt.

Our population and our use of the finite resources of planet Earth are growing exponentially, along with our technical ability to change the environment for good or ill.

Saving our planet, lifting people out of poverty, advancing economic growth... these are one and the same fight. We must connect the dots between climate change, water scarcity, energy shortages, global health, food security and women's empowerment. Solutions to one problem must be solutions for all.

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

As a global community, we have to start thinking more seriously about whether there are limits to what our earth can bear and if we're willing to cope with the struggle for limited resources, which only seem to increase as our population does.

I always thought we had an environmental problem, but I hadn't realized how urgent it was. James Lovelock writes that by the end of this century there will be one billion people left.

With the world's human population now at seven billion and growing, and the demand for technology and modern conveniences increasing, we can't control all our negative impacts. But we have to find better ways to live within the limits nature and its cycles impose.

I think its time to change and balance the environment and growth. If we don't do that, we're going to suffer a hard landing one day very soon.

Human beings are going to be relying on natural resources for a long time.

We have reached a new milestone as a human family. With seven billion of us now inhabiting our planet, it is time to ask some fundamental questions. How can we provide a dignified life for ourselves and future generations while preserving and protecting the global commons - the atmosphere, the oceans and the ecosystems that support us?