Oh for the Safety of the Chlorophyll Based Economy

I'm searching for a term to contrast with "carbon-based economy". But the title is tongue-in-cheek; witness this sentence quoted in today's NYTimes Book Review: "“In the New York of 1867,” he writes, “horses were killing an average of four pedestrians a week (a bit higher than today’s rate of traffic fatalities).”" (Review of the book called Traffic, which sounds interesting.)