john van oldenborg and raine harsma uncovered it and began scouring its contents. the paper's impressive prognostication, the paper's impressive prognostication is the best kind of vindication for hansen who has suffered more than his share of the slings and arrows from climate deniers in the media. a complex world of climate science he concludes rarely enjoys such clear validation. when such an opportunity presents itself, we owe it to ourselves to make some noise about it. so with appreciation to jim hansen for how the actual science has borne him out over the past 30 years and with respect for the predictions that he makes, we should as soon as we can begin to address ourselves to this problem. jim is not alone in this. the -- an array of scientific organizations wrote us all a letter back in october of 2009. its conclusion is pretty clear and stark in scientific language. observations throughout the world make it clear that climate change is occurring, and rigorous scientific research demonstrates that the greenhouse gases emitted by human activities are the primary driver. these conclusions are based on multiple independent lines of evidence and contrary assertions are inconsiste