More on the letter:

30 leading scientists (led by Nobel laureate Mario Molina and others) 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

See coverage in the Washington Post and Inside Climate News.

The full text of scientists’ letter is here.