On my recent trip to Israel, I had the opportunity to visit Yad Vashem, Israel's national Holocaust memorial, and reaffirm our collective responsibility to confront anti-Semitism, prejudice, and intolerance across the world. On this Yom Hashoah, we must accept the full responsibility of remembrance, as nations and as individuals-not simply to pledge "never again," but to commit ourselves to the understanding, empathy and compassion that is the foundation of peace and human dignity.

We can't expect to solve problems if all we do is tear each other down. You can disagree with a certain policy without demonizing the person who espouses it.

Look at Chancellor [Angela] Merkel, her personal story helps to tell a story of incredible achievement that the German people have embarked on and I think is something that you should be very proud of.

I accept that people are going to call me awful things every day, and I will always defend their right to do so.

When times change, so must we.

If we're going to prevent large parts of this Earth from becoming not only inhospitable but uninhabitable in our lifetimes, we're going to have to keep some fossil fuels in the ground rather than burn them and release more dangerous pollution into the sky.

I make no apologies for being reasonable.