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Lamp Shades On Fire by Modest Mouse is currently in the lead. Fun hard driving beat with an on point environmental message that's not annoyingly preaching.
Probably whatever is on whatever radio station at the time I "fire it up." The perceived quality of the base sound system will determine what I play after that. If the bass is sucky, that will rule out a lot of stuff.
Although...something by Plankeye would most certainly be appropriate.