There will be water and food fights everywhere.

We need to have a plan equal to the challenge.

Water and sanitation has not had the same kind of champion that global health, and even education, have had.

Ending poverty and ensuring sustainability are the defining challenges of our time. Energy is central to both of them.

One of the most important things about leadership is that you have to have the kind of humility that will allow you to be coached.

No matter how good you think you are as a leader, my goodness, the people around you will have all kinds of ideas for how you can get better. So for me, the most fundamental thing about leadership is to have the humility to continue to get feedback and to try to get better - because your job is to try to help everybody else get better.

If we do not act to curb climate change immediately, we will leave our children and grandchildren an unrecognizable planetIt is the poor, those least responsible for climate change and least able to afford adaptation, who would suffer the most.