Oh boy. As a worker in a building that insisted on putting trees and large plants where they don't belong, like 9 stories above ground or wedged into tight covered courtyards, this is plan for disaster. The artificial light-catching equipment just might work on sunny days--I've never seen any in action, and I'm skeptical how well the above ground part can be integrated into a busy street without looking uglier than a cell phone tower--but think of all the energy you waste on artificial light for the other days. Green project, this is not; plants require a lot of light. That's why they grow in the sun, you know, and absolutely never in a subway tunnel. And some will still die, and then you are hauling trees, soil, and landscaping equipment in and out of a constricted space all the time.<p>This will be a ton more expensive than the High Line, and probably a horticultural nightmare.<p>Plus, people go to parks to get fresh air and enjoy a view, right? Not to inhale canned fumes in the dark...