End the paper-or- plastic debate and simultaneously mitigate some of the holiday seasons inevitable gluttony by giving a gift that does some quantifiable good for your hometown. With each sale of Hable Constructions untreated-cotton canvas shopping bags, designed exclusively for Barneys New York (Barneys Co-Op, 236 W. 18th St., nr. Eighth Ave.; 212-593-7800), $10 of the $75 price tag goes to the City of New York to plant trees in public parks. The bags oversize shape and over-the-shoulder straps make it handy for lugging home the ingredients for a seasonal feast and for hauling your gear to the gym to work it off. For more on gifts that contribute to local needs, click ahead.