On Tuesday, Dec. 12, tune in to WNYC-New York Public Radio at noon to hear host Leonard Lopate with guest Alex Steffen, co-founder of WorldChanging.com and editor of the WorldChanging book. And turn out for the Big Green Drink Holiday Party from 7 pm to midnight to chill with Alex, other WorldChangers, and a lively mass of the city's eco-minded over organic drinks and nibbles.

Location: "M1-5", 52 Walker Street between Church and Broadway; $15 suggested donation - bring your business cards to be in the raffle for an eco-resort vacation in Costa Rica, more. More info at Green-links.org.