A Science Adviser Unmuzzled Q&A: NASA's chief climate scientist, who charged that his views on global warming were being squelched, says we're getting close to a tipping point Friday, Mar. 24, 2006 Subscriber content preview. Log-In Share Facebook Twitter Tumblr LinkedIn StumbleUpon Reddit Digg Mixx Del.i.cious Google+ To continue reading: Log-In Want the full story? Subscribe Now Get TIME the way you want it One Week Digital Pass — $4.99 Monthly Pay-As-You-Go DIGITAL ACCESS — $2.99 One Year ALL ACCESS — Just $30! Best Deal!Print Magazine + Digital Edition + Subscriber-only Content on TIME.com Learn more about the benefits of being a TIME subscriberIf you are already a subscriber sign up — registration is free!