We will never end poverty if we don't tackle climate change.

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.

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

When you're working on development issues, optimism is not always based on rational analysis, often it is a moral choice.

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.

Carbon is the currency of how you measure climate change, but water will be the teeth.

What happens when corn and wheat prices rise is that we see real increases in malnutrition and under-nutrition. And when children are malnourished, their brain development actually slows down and is affected. So this is not just a short-term impact.