Driverless cars are coming to your street - the only question is, 'When?'

And when these advances are made, hydrogen can fill critical energy needs beyond transportation. Hydrogen can also be used to heat and generate electricity for our homes. The future possibilities of this energy source are enormous.

On the battlefield, the military pledges to leave no soldier behind. As a nation, let it be our pledge that when they return home, we leave no veteran behind.

TPP replicates similar language from past trade agreements that has allowed foreign corporations the right to challenge U.S. federal, state, and local laws outside of American courts. These tribunals will not meet our high standard of transparency and due process, and they will rely on weak impartiality rules for selecting judges.

Leaders lead. They don't divide; they don't create a climate that is poisonous.

I believe that it is impossible to stop people from using the fossil fuels, so we need to develop technologies which allow us to use them without creating environmental havoc on the planet.

The whole action around a carbon pricing mechanism, or carbon tax, is what you do with the money. Both France and Washington state proposed solving climate on the backs of workers. And that's a bad strategy.

Many climate scientists say their biggest fear is that warming could melt the Arctic permafrost - which stretches for thousands of miles across Alaska, Canada, and Siberia.