The scientific evidence of how serious this climate crisis is becoming continues to amass week after week after week.

Earlier in this century, the Heisenberg Principle established that the very act of observing a natural phenomenon can change what is being observed. Although the initial theory was limited in practice to special cases in subatomic physics, the philosophical implications were and are staggering.

Today we're dumping 70 million tons of global-warming pollution into the environment, and tomorrow we will dump more, and there is no effective worldwide response. Until we start sharply reducing global-warming pollution, I will feel that I have failed.

I don't have the illusion that there's any position or role in the world with as much potential for bringing about change as that of president of the United States.

There are some bright spots, to be sure, but the internet is still in a Wild West phase, as was the case during the early age of the printing press as well.

Take it from me - every vote counts. In our Democracy, every vote has power. And never forget - that power is yours. Don't let anyone take it away or talk you into throwing it away. And let's make sure that this time every vote is counted.

Our new technologies, combined with our numbers, have made us, collectively, a force of nature