I think we need to be careful about destroying the environment. If its a choice between upzoing some areas of Tribeca/Chinatown or destroying the Hudson marine environment, why is there even a debate?
When we first build the landfill for Battery Park City, don't forget the Hudson was a pile of toxic sludge. Now that its nice, we should keep it that way. Sometimes, we should learn from past mistakes - polluting the Hudson was one of the worst decisions New Yorkers ever made.