Here's the truth: even if countries like the United States curb our emissions, if growing countries like India - with soaring energy needs - don't also embrace cleaner fuels, then we don't stand a chance against climate change.

Jimmy Carter will go down in American history as 'the president who lost Iran,'

The Supreme Court had the choice not only which way to rule, pro- or anti-gay marriage rights, but also how they were going to rule. They could have ruled just federalism, saying, "This isn't a matter for federal; this isn't a federal issue at all. States should decide it." Or they could decide it on equal protection grounds and say that, "Gay discrimination is wrong."

You can choose a future where more Americans have the chance to gain the skills they need to compete, no matter how old they are or how much money they have. Education was the gateway to opportunity for me. It was the gateway for Michelle. And now more than ever, it is the gateway to a middle-class life.

And if we walk away now, if we simply retreat into our respective corners, we will never be able to come together and solve challenges like health care, or education, or the need to find good jobs for every American.

The Internet didn't get invented on its own. Government research created the Internet so that all the companies could make money off the Internet. The point is, is that when we succeed, we succeed because of our individual initiative, but also because we do things together.

Entrepreneurs embody the promise of America: the idea that if you have a good idea and are willing to work hard and see it through, you can succeed in this country. And in fulfilling this promise, entrepreneurs also play a critical role in expanding our economy and creating jobs.