Some quotes
"Not only can we afford it, it would be cheaper for us. And yet we do nothing."
"We're not going to act until this crisis hits the economy... When will this happen? In my view it's already begun... Occupy protests... spiraling debt crisis... growing inequality... money's influence on politics.... resource constraints... This is a system in the painful process of breaking down."
"The crisis is inevitable. The issue is how will we react."
"Imagine China, India, Pakistan... at war over food and oil... 30% unemployment in America... What does that mean for you?"
Always good to hear it said different ways.

This video might serve as a very compelling intro to the Crash Course. This talk is accessible and engaging, then the Crash Course provides the supporting data and arguments.
Quotes:
Watch this talk »
http://www.ted.com/talks/paul_gilding_the_earth_is_full.html