Aarey protest: Why can't metro shed be made outside forest area?

During a debate at India Today TV, Bharatiya Janata Party leader Shaina NC listed down some of the reason why the location of metro rail shed can't be shifted to a different location at this point of time. She said, "The carbon footprint incurred by the cars which pass the area on a daily basis is much more than the felling of 2000 trees."