30 leading scientists (led by Nobel laureate Mario Molina, and including 3 from U. of Arizona: Scott Saleska, Jonathan Overpeck, Joellen Russell) respond to EPA chief Scott Pruitt’s doubt that human-emitted CO2 is a cause of warming.
The letter notes that “focusing on disagreements over details, or among a few individuals on the margins of consensus, or on the uncertainties that are part of any accurate statement of scientific knowledge, misses the big picture: human beings are changing the Earth’s climate. This key conclusion follows from the basic laws of physics. Just as there is no escaping gravity when one steps off a cliff, there is no escaping the warming that follows when we add extra carbon dioxide and other greenhouse gases to the atmosphere”
The full text of scientists’ letter is here.