Watch Now: BIll McKibben: ‘At this point, short of self-immolation in Times Square, there is really not much more that the scientific community can be doing to warn us’
McKibben slams Obama for being too timid in fighting global warming: 'We are going to need far far more ambitious attempts than the Obama administratino has put forward so far.'
'Global warming is out of control and the biggest threat that human beings have ever faced,
