I like this video from the post carbon institute. It has a terrible title. But it does a great job of making the point that there isn't a magic bullet that will keep our energy-pig society running just by switching to alternative technologies. It ties together the threads of resource scarcity, energy, climate change, and economic systems that demand growth....how we got where we are, and where it's going. If you've got the time I highly recommend it. It came to to mind after reading a good post today that quantified the manure equivalent (in pounds, to convert to biogas) of a gallon of gasoline.