Global warming is not just the greatest environmental challenge facing our planet - it is one of our greatest challenges of any kind.

Around the world, Gandhi, Nelson Mandela -- what they did was hard. It takes time. It takes more than a single term. It takes more than a single president. It takes more than a single individual.

We will respond to the threat of climate change, knowing that the failure to do so would betray our children and future generations

I have never had to travel more than thirty seconds from home to office, and it's because of that that I've been able to maintain, really a family life that has nurtured and sustained me during this time [of presidency].

Several Americans, unjustly detained by Iran, are finally coming home. In some cases, these Americans faced years of continued detention, and I've met with some of their families. I've seen their anguish, how they ache for their sons and husbands. I gave these families my word. I made a vow that we would do everything in our power to win the release of their loved ones, and we have been tireless.

We don't ask you to believe in our ability to bring change, rather, we ask you to believe in yours.

For we have always understood that when times change, so must we, that fidelity to our founding principles requires new responses to new challenges, that preserving our individual freedoms ultimately requires collective action.