The increase in the greenhouse gas concentrations in the atmosphere are having an effect. Our ability to predict that effect is very limited.

We've seen what violent regime change looks like in Libya and the kind of chaos that can be unleashed. And, indeed, the kind of misery that it enacts on its own people.

We are making tremendous progress that ISIS really does present to the homeland and to other homelands of allies around the world.

I do not think Syria can achieve international recognition in the future - even if they work through a successful political process, you know, the international community simply is not going to accept a Syria led by the Assad regime.

We're hopeful that Russia will choose to play a constructive role in supporting ceasefires through their own Astana talks, but also, ultimately, through Geneva. And if we can achieve ceasefires in zones of stabilization in Syria, then I believe we will have the conditions to begin a useful political process.

We express America's values from the State Department. We represent the American people. We represent America's values, our commitment to freedom, our commitment to equal treatment to people the world over. And that message has never changed.

People who speak up for freedom in regimes that are repressive are often at threat.