If we want America to stay on the cutting edge, we need young Americans to master the tools and technology that will change the way we do just about everything.

The hard truth is carbon pollution has built up in our atmosphere for decades now. And even if we Americans do our part, the planet will slowly keep warming for some time to come.

And lest we get on our high horse and think this is unique to some other place, remember that during the Crusades and the Inquisition, people committed terrible deeds in the name of Christ. In our home country, slavery and Jim Crow all too often was justified in the name of Christ.

But having made my decision as Commander-in-Chief based on what I am convinced is our national security interests, I will seek authorization for the use of force from the American people's representatives in Congress.

For history tells us that while these truths may be self-evident, they've never been self-executing. That while freedom is a gift from God, it must be secured by his people here on earth.

We have to deal with issues like inequality, we have deal with issues of economic dislocation, we have to deal with peoples fears that their children won't do as well as they have. The more aggressively and effectively we deal with those issues, the less those fears may channel themselves into counter-productive approaches that pit people against each other.

I believe in term limits for presidents because I think that there is no doubt I'm a better president now than I was when I start. I would argue that I am the best president I've ever been over the last year or two. My team is more effective than it's ever been.But what is also true is that number one, this is grueling.