The Jackson County (NC) Green Energy Park just did the worlds first melt using landfill gas. Both aluminum and bronze were cast. Here’s an article from the Asheville paper about it, and here’s a quick Youtube video of the first pour.
That’s me off to the left, staying the hell out of the way! Here’s the second pour:
I missed this one, I was on vacation, but I saw some of the results and they looked really good.