The true value of a forest cannot be measured in board feet, but in the breath of the planet.

The idea of America is so important to me. It's about freedom, democracy, and the ability to create your own destiny.

Collaboration across industries is key to solving the global challenges we face in food security.

And I hope you will come back here to Harvard 30 years from now and reflect on what you have done with your talent and your energy. I hope you will judge yourselves not on your professional accomplishments alone, but also on how well you have addressed the world's deepest inequities…on how well you treated people a world away who have nothing in common with you but their humanity.