New York Times: Two prominent analysts of human-driven global warming have offered fresh criticisms of the way Anthony Ingraffea, a Cornell University engineering professor, has been portraying the contribution of natural gas leaks to climate change. The researchers are Raymond Pierrehumbert, a climate scientist at the University of Chicago, and Richard A. Muller, a physics professor at the University of California, Berkeley who is best known of late for his research corroborating the extent of recent climate warming....