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.

What's at risk [in 100 years] if we do not take action, truly is the survival of civilization as we know it... Literally that is the case. We have seen global warming so far of just a little bit less than one degree Celsius and look at what's happened. Superstorm Sandy. Boulder Colorado. All these fires. Hurricane Irene one year before.

In order to solve the climate crisis, we need to solve the democracy crisis.

I think the cost of energy will come down when we make this transition to renewable energy.

Of all the works of civilization that interfere with the natural water distribution system, irrigation has been by far the most pervasive and powerful.

I think the ethical standards established in this White House have been the highest in the history of the White House.

I saw the logarithmic growth of computer power.