Jim Hansen has clearly determined that the time to stay silent has 
long past. That urgency demands urgent voices. That he must — and other scientists — should speak out forcefully.
Hansen is not just speaking forcefully, he is also speaking eloquently. This past week, at a Re-Energize America event, Hansen gave a speech that spoke to the risks of Global Warming and discussed his draft Declaration of Stewardship for the Earth and all Creation to be asked of every candidate (at all levels).