It's not that easy to quit. When you look back in the American system it is very rare that people quit on issues of principle.

More countries have understood that women's equality is a prerequisite for development.

I don't see a situation where one side will win militarily, take over Syria, and there will be peace and quiet, a clean victory.

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

Young people should be at the forefront of global change and innovation. Empowered, they can be key agents for development and peace.

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.

I can't think of a 30- or 40-year-old who can behave like Mugabe. They wouldn't even know where to begin, and given their own educational exposure, I think it will be very positive for Africa.