And the winning tweet is...

@timrider: "Save elevator/qi che power with roof based building2building ziplines! Super quick commute & likely reduced death defiance!" Sure it's not the most practical, but it's a fun thought and it caused us to have a good laugh. If there's anything we WOULD love to do to save the environment, it'd be to act like an urban Tarzan. @timrider wins a night at URBN, China's only eco-friendly hotel, located in the heart of Jing'an. The runner ups: @leirda with "mass broadcast of Captain Planet on public transport TVs to begin the recruitment of 1.3 billion planeteers. Go Planet!" (We loved Captain Planet as kids) and @cedric_c with "Save tons of CO2/month forbidding all media besides Shanghaiist. Less CO2, Greener city, only 1 media to spend green $ for ads." (because we're flattered).