Over the years, I have seen the power of the oceans to excite, feed, and sustain people. I have also seen them undergo a growing onslaught of attacks, from destructive fishing practices to rising acidification.

Instead of hazarding our future on the dirty fuels of the past, let's invest in clean power that can drive this country forward. Let's cut energy waste, make our economy the world's most efficient, and give our workers a leg up in the global marketplace.

Nearly every president in the past 100 years has declared national monuments, from Teddy Roosevelt creating the Grand Canyon National Monument to George W. Bush preserving 10 islands and 140,000 square miles of ocean waters in the Northwestern Hawaiian Islands.

The U.S. has a proud history of cleaning up our air through technological innovation. We did it with leaded gas, acid rain and countless other pollutants, and we can do it with carbon pollution, too.

When I became CEO, I was really worried that we were in commoditized segments that were mature and no longer growing. So we made a radical pivot into health technology because that is one of the world's unmet needs.

True security is based on people's welfare - on a thriving economy, on strong public health and education programmes, and on fundamental respect for our common humanity. Development, peace, disarmament, reconciliation and justice are not separate from security; they help to underpin it.

What's so brave about being bald? I've not fought for my country or found the cure for cancer - I've just gone out without my hat on!

After cancer, I ain't scared of nothing.