Clearly, U.S. cooperation with China is absolutely essential to successful efforts to combat climate change.

No matter what the aggressor intends to do, when the world is truly united, it is then the world, not the aggressor, determines how events develop.

So the 20th century taught the world not to use nuclear weapons and not to proliferate. This is not a good strategy because recent history has shown that wars could erupt with equal devastation.

In every great challenge this country has faced, it has turned to the essential strength of its people, united around a common goal.

In the past, human progress had to come at the cost of the environment. If we wanted energy, we had to burn wood or we had to burn fossil fuels. If we wanted to grow more food, we had to expand farmland, often at the cost of forests. But technology and innovation means we're very quickly decoupling these impacts, such that this conflict is no longer true.

[Angela Merkel] showed what can be achieved when politicians take the right course of action and work to find solutions to the world’s challenges rather than simply shift responsibility to others.

On composure

Today, we celebrate our gay pride.

It is impossible to put up forever with this boorishness toward our country.