Hill: More than 25 years ago, the Reagan administration acknowledged the importance of studying the greenhouse effect. In 1990, conservative icon Margaret Thatcher--speaking at the 2nd World Climate Conference--warned that climate change is real enough for us to make changes and sacrifices, so that we do not live at the expense of future generations. To hear these political giants call for climate action, as they do in this video, is to recognize that this issue is an inherently conservative one. ...