The current study explores the role of source credibility in continued public concern over climate change and GM foods, suggesting that this skepticism is more likely driven by perceptions of scientists as knowledgeable, trustworthy, and unbiased- the three primary constructs of source credibility (McCrosky & Teven, 1999; Teven 2008). We analyze data from the 2006 GSS survey to empirically measure the components of source credibility, comparing their influence and relationship to political ideology in perceptions of CC impacts and willingness to consume GM foods.