I think we should bring back horses as a form of mass transport. Efficent use of biomass as fuel (grass), wastes primarily organic compost, and Co2 and methane I guess same as those damn cows. Plus you get saddlesores and chaps and "pretty damn Western" stuff like that. Use climbing knots to tie up Mr Ed to the ol' hitchin post while you go into Starbucks for a latte... instant yuppie envy! "Still driving that old nag? I just bought a new Lippizaner!"