Tri-State Biodiesel was on hand promoting waste oil biodiesel, as well as luring people into a bit of biofuels education with the promise of TSB pins -- the key theme seemed to be that all the bad press around biofuels made from food crops really doesn't apply to using waste cooking oil as a feedstock, and that this is one of the greenest options out there.
All photos in this slideshow: Matthew McDermott
Get up close and personal with the natural world with these amazing photos.
Use this list to clean without spreading toxic chemicals around your home.
Don't miss the beer-can shingles on this DIY beauty that was built in a day
Sustainable options abound if you want to add some spice to your knickers.
The Silo House is made from empty oil silos and is super-green to boot.
African penguins struggle in the wild but a budding love is offering hope.
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