"The reductionist measure of yield is to agriculture systems, what GDP is to economic systems. It is time to move from measuring yield of commodities, to health and well-being of ecosystems and communities. Industrial agriculture has its roots in war. Ecological agriculture allows us to make peace with the earth, soil and the society."

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There was a transition going on - Baghdad being the intellectual capital of the world where major advances were made in agriculture and mathematics and engineering and medicine and astronomy, and then that all sort of collapsed. And I was trying to understand how such a intellectually fertile environment can lose its compass bearing. Because I think about the creative centers today - countries, or even regions. Will Silicon Valley always be as innovative? Will the United States be innovative, or will we become complacent?

— Neil deGrasse Tyson