Perhaps the single most successful international agreement to date has been the Montreal Protocol.

We were all children once. And we all share the desire for the well-being of our children, which has always been and will continue to be the most universally cherished aspiration of humankind.

It is true that the principle of national citizenship, associated with rights, and the control of a country's borders are two key aspects of modern 'sovereign' nation states as they emerged in the Westphalian order. But there has been much progress since 1648.

I urge you to celebrate the extraordinary courage and contributions of refugees past and present.

My intimate knowledge of the [UN] system allowed me to get things done despite the many obstacles.

If we get agriculture right in Africa, where most of the people now are working in that sector, not only would it help boost development but we will be secure in terms of food and nutrition and then be able to move on to other areas.

Under international law, the responsibility for protecting civilians in conflict falls on the belligerents. Under military occupation, responsibility for the welfare of the population falls on the occupiers.