He believes scientists are conspiring to mislead the public on climate change, and has repeatedly voted to hamper efforts to deal with climate change.
For instance, he voted for an amendment that would stop the USDA's plans to consider what effects climate change could have on US agriculture and develop plans to deal with any such changes. Here are USDA plans that Ryan is against: http://www.ocio.usda.gov/directives/doc/DR1070-001.pdf
He also voted to eliminate the White House's assistant on climate change. Ryan appears to believe in a "Don't Ask, Don't Tell" policy when it comes to climate change.
He also voted to eliminate DOEs advanced research projects agency.
What are his anti-science beliefs? Seriously curious ... will Google it, but appreciate your thoughts.