One strategy: "We've had three big ideas at Amazon that we've stuck with for 18 years， and they're the reason we're successful: Put the customer first. Invent. And be patient."

Coal will remain part of the energy mix, but it must be cleaner and more responsible.

The future of food security lies beneath the waves—if we dare to farm it responsibly.

The great challenge of our time is to build institutions that can manage the complexity of modern societies.