Some have suggested that ideally there must be some international body that would treat areas like the Arctic as a global commerce, a bit like the way we treat the sea. It doesn't belong to any particular country, but to all of us, but I'm not sure some of the powerful are ready for that sort of solution.

Invite politicians to dinner and let them tell the world how delicious it is. . . . They will proudly go around and say, 'I ate crickets, I ate locusts, and they were delicious.'

It is tragic that so few young people in Western democracies vote. They have forgotten that their ancestors fought for the right to choose and change their leaders. They don't realise that their votes are more important than their tweets or Facebook posts.

Gender equality is more than a goal in itself. It is a precondition for meeting the challenge of reducing poverty, promoting sustainable development and building good governance.

Change is a process which has to be managed. If it's managed and managed well in the interest of the nation and the people, the likelihood is that it will end well.

Literacy unlocks the door to learning throughout life, is essential to development and health, and opens the way for democratic participation and active citizenship.

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