I learn something from criticism because when it comes from sources you respect you always examine it and learn.

Inertia is a powerful force in human and political affairs.

Nevertheless, the concept of sustainable development is now known - even amongst those who haven't accepted it - and it's recognized, debated and followed by an increasing number of businesses.

Also, it is interesting that developing countries, with China and India perhaps in the lead, where the future of the global environment will be decided are now on board with the case for sustainable development.

We must, from here on in, all go down the same path... There may not be another chance.

I am President of the UN created University for Peace, which has a strong commitment to the relationship between peace, security and the environment. I meet with young people around the world and I always come away enthused and encouraged.

I learn something from criticism because when it comes from sources you respect you always examine it and learn.