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Iowa Senator Joni Ernst spoke at the hearing and discussed why the Renewable Fuel Standard is critical to America’s national security.

Iowa Senator Joni Ernst spoke at the hearing and discussed why the Renewable Fuel Standard is critical to America’s national security.

Iowa Senator Joni Ernst spoke at the hearing and discussed why the Renewable Fuel Standard is critical to America’s national security.

Iowa Senator Joni Ernst spoke at the hearing and discussed why the Renewable Fuel Standard is critical to America’s national security.

We did have blue sky, and i learned my swimming in the nearby river. but now, you know, we lost blue sky and much of the clean water. >> how did china lose its blue sky? >> 35 years of massive industrialization and urbanization, and it's very much coal-based energy and pollution-intensive. >> ma jun says inhaling the dirty area is a lot like inhaling cigarette storm. he took me to a store you can probably only find in china. it's the clean air center. it specializes in masks, filters, and other devices to protect families from the pollution. of all the things that we've seen, this one bothers ...