Sorry, I have a news flash for everyone.
Burning Man is not "Sustainable". OK?
There is NOTHING eco-friendly about 37,000 people driving X amount of distance into the middle of the desert, building monster domes made out of PVC with vinyl covers and lighting a 40ft. tall wooden man covered in neon with a fuckton of pyro, surrounded by jet engine powered dune buggies, and enough fossil fuel powered generators to light up Vegas.
If you want to save the environment, stay home!
Now, if you want to switch over from using a generator to solar in your camp, GREAT! If you seperate all of your trash, take it home and recycle it, good for you! If you refill one plastic water bottle instead of 100 over the week, excellent! But please, please, please don't con yourself into thinking that this event will ever become "Sustainable" (do the people who use this word even know what it means??).