Climate change...is, simply, the greatest collective challenge we face as a human family.

Achieving gender equality requires the engagement of women and men, girls and boys. It is everyones responsibility.

Today, we have more than 110,000 men and women deployed in conflict zones around the world. They come from nearly 120 countries ... Thanks to their efforts, life-saving humanitarian assistance can be delivered and economic development can begin.

Men must teach each other that real men do not violate or oppress women - and that a woman's place is not just in the home or the field, but in schools and offices and boardrooms.

You have to work and think about how we can make this world a better place for all. This is what I'd really like to ask our young leaders. We will try as leaders of today to minimise the problems which we will hand over to you. But it is to you. You have to take ownership and leadership of tomorrow. For that to be possible, you have to strengthen your capacity and widen your vision as a global citizen.

We must follow the wisdom of the Brundtland Report. We must pursue development that meets the needs of the present generation without compromising the ability of future generations to meet their needs.

With her courage and determination, Malala has shown what terrorists fear most: a girl with a book.