by Kevin Hughes | Natural News The 2009 leak of emails from the Climatic Research Unit at the University of East Anglia revealed efforts by scientists to hide flaws, exclude skeptics and withhold data, raising serious questions about the transparency and credibility of the IPCC. The IPCC has been criticized for using non-peer-reviewed sources, such as environmental advocacy group newsletters, leading to retractions of claims about the Amazon rainforests, African crop harvests and Himalayan glaciers. The NIPCC report challenges the IPCC’s assertion that most warming since the mid-20th century is due to human greenhouse gas emissions, arguing that natural causes are […]