A team of citizen science volunteers from Skeptical Science surveyed over 12,000 peer-reviewed climate science papers finding that over 97% of those papers agreed that humans were the cause of climate change. The survey expanded on climate scientist Naomi Oreskes' survey of 928 peer-reviewed climate papers published between 1993 and 2003 that also showed the same majority ruling. Naomi Oreskes visited the Global Institute of Sustainability in April to speak at the Institute's Wrigley Lecture Series on the spread of climate change denial. The survey by Skeptical Science also showed that consensus has grown slowly over time between 1991 and 2011. Surveys like the ones from Oreskes and Skeptical Science can help alleviate the misconceptions behind climate change and lead to more informed decisions and behavior.