When Taylor C. Weaver isn’t taking part in billion-dollar transactions at Winston & Strawn LLP, he’s leading a group that could be considered the attorney version of Captain Planet and the Planeteers.The 27-year-old associate joined forces with other lawyers last year to start the Urban Energy Garden, a nonprofit organization with two goals: Fight pollution that is affecting minority communities and bolster minority representation at environmental regulatory agencies.At the time, Weaver was in his third …