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

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.

One of the main lessons I have learned during my five years as Secretary-General is that broad partnerships are the key to solving broad challenges. When governments, the United Nations, businesses, philanthropies and civil society work hand-in-hand, we can achieve great things.

For my generation, coming of age at the height of the Cold War, fear of nuclear winter seemed the leading existential threat on the horizon. But the danger posed by war to all humanity-and to our planet-is at least matched by climate change.

A deal must include an equitable global governance structure. All countries must have a voice in how resources are deployed and managed.

We hold the future in our hands, together, we must ensure that our grandchildren will not have to ask why we failed to do the right thing, and let them suffer the consequences.

SUSTAINABLE PEACE IS POSSIBLE ONLY WITH WOMEN'S FULL PARTICIPATION, their perspectives, their leadership, their daily, equal presence wherever we seek to make and keep the peace.