Throughout American history, there have been moments that call on us to meet the challenges of an uncertain world, and pay whatever price is required to secure our freedom.
I remember, right after Hezbollah launched its rocket attacks on Israel, I said: This is a clarifying moment; this is a chance for the world to see the threats of the 21st century, the challenge we face.
We too often let the material things serve as indicators that we're doing well, even though something inside us tells us that were not doing our best. That we are avoiding that which is hard, but also necessary. That we are shrinking from rather than rising to the challenges of the age.
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.
Today I challenge our nation to commit to producing 100 percent of our electricity from renewable energy and truly clean carbon-free sources within 10 years.