In votes Wednesday on amendments to the controversial Keystone XL pipeline bill, some Republican Senators finally went on record acknowledging that man-made climate change is real. But it is clear that the Republican leadership and most members of their caucus still have no plans to do something about it.
As I explained in Deep Future: The Next 100,000 Years of Life on Earth, the message from the geological past is not "big deal, appalling climate disasters have happened before." Climate science tells us that we don't want to go through equally appalling disruptions of our own making, and also that we don't necessarily have to.
More than 97 percent of climate scientists agree that global warming is happening now; that it is largely caused by human activities; and that it poses significant risks to our health and our well-being. Yet too many elected officials appear determined to either ignore or refute the facts when it comes to climate change.
Let's hope that the tide soon washes away not only skepticism, but also the skeptics who for one reason or another refuse to accept reality. When they occupy leadership positions in government and block responsible action, they are as much a threat to national security as the climate disruptions they ridicule.