The truth about the climate crisis is still inconvenient for the large carbon polluters and the politicians who are in their pockets.

We must quickly mobilize our civilization with the urgency and resolve that has previously been seen only when nations mobilized for war. These prior struggles for survival were won when leaders found words at the 11th hour that released a mighty surge of courage, hope and readiness to sacrifice for a protracted and mortal challenge.

Many of the green places and open spaces that need protecting most today are in our own neighborhoods. In too many places, the beauty of local vistas has been degraded by decades of ill-planned and ill-coordinated development.

The gay rights movement of recent years has been an inspiring victory for humanity and it is in the tradition of the civil rights movement when I was a young boy in the South, the women's suffrage movement when my mother was a young woman in Tennessee, the abolition movement much farther back, and the anti-apartheid movement when I was in the House of Representatives. All of these movements have one thing in common: the opposition to progress was rooted in an outdated understanding of morality.

Remember America, I gave you the Internet and I can take it away.

The will to act is a renewable resource.

Two thousand scientists, in a hundred countries, engaged in the most elaborate, well organized scientific collaboration in the history of humankind, have produced long-since a consensus that we will face a string of terrible catastrophes unless we act to prepare ourselves and deal with the underlying causes of global warming.