People are less certain of their national identities or their place in the world. It starts looking different and disorienting. And there is no doubt that that has produced populist movements both from the left and from the right in many countries in Europe.

There are times where I've made mistakes or our administration hasn't always aligned ourselves with the values we need to align ourselves with. It's a work of constant improvement.

Angela [Merkel] and I also agreed the need for a comprehensive and humane response to the devastating humanitarian crisis in Syria and for the influx of migrants and refugees from around the world. We need to build on the progress achieved at the U.N. Refugee Summit, which yielded new commitments from some 50 nations and organizations.

It's not because John McCain doesn't care. It's because John McCain doesn't get it.

The absence of hope can rot a society from within.

And as husbands and fathers and brothers, we have to step up - because every girl’s life matters. Every daughter deserves the same chance as our sons. Every woman should be able to go about her day - to walk the streets or ride the bus - and be safe, and be treated with respect and dignity. She deserves that.

What we can be scientifically certain of is that our continued use of fossil fuels is pushing us to a point of no return