Many of the wars we see around the world start as domestic conflicts that are fueled by external forces and powers. My view is that we can help peace if we help communities transform from the inside, on their own terms.

For many child soldiers, war and violence are all they have ever known. If we don't take it upon ourselves to show them an alternative, then they're going to be soldiers forever, and they'll continue to be recruited and to participate in violence if another conflict starts five or 10 years down the road.

I've been trying to understand conflict and violence ever since I was a kid. You know. There were a few things that happened even on my block - the Black Panthers used to be right around the corner from where we were.

While it's easy for South Sudan to feel distant, the situation is all too real for the South Sudanese mothers choosing which child gets to eat tomorrow. This is a time when we must look outward together and declare that humanity has no borders - no one deserves to suffer like this, especially in a world of such abundance.

Following the missile crisis, detente started to gain ground between the United States and the Soviet Union, so the international political climate improved after that.

We have to wrap this imperative of addressing climate change in a prosperity framework, and secondly we have to do a much better job of putting forward an American jobs agenda that's a match for the climate challenge.

I reflect back 35 years ago, and look how far we have come in America with our environmental policy to improve the conditions of our air and water, and we have had some real successes.

Planting native species in our gardens and communities is increasingly important, because indigenous insects, birds and wildlife rely on them. Over thousands, and sometimes millions, of years they have co-evolved to live in local climate and soil conditions.