Picture the world as it looks from space: Blue water, wisps of clouds, deserts and ice caps – but no national borders. When it comes to living in a healthy world, borders are irrelevant. Pollution, SARS, climate change, AIDS: these potentially devastating problems affect us all equally and cannot be solved without a global approach.

To make the world a better place for future generations, we will have to work with other countries to set out rules we can all live by.