According to Biodiesel magazine, the U.S. national parks system celebrated more than 10 successful years of environmental initiatives such as green cleaning and biodiesel use. Many of the national parks have replaced traditional petroleum-based lubricants and cleaners with soy-based products.

"We have switched from over 140 somewhat toxic cleaning and janitorial products from the park to nine biobased products that come out of Nebraska," said Yellowstone National Park Environmental Manager Jim Evanoff.

According to the article, park officials have seen a substantial decrease in costs since switching to green cleaning products and biodiesel, but official numbers have not yet been released.

"Yellowstone National Park was the first national park established in the world. With that being said, we feel an obligation to be first at doing the right thing environmentally, and as a result we have undertaken a whole cadre of initiatives,” Evanoff said.

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