A University of Maine professor will be among the researchers spotlighted this Sunday during a “60 Minutes” special on global warming.

Paul Mayewski, director of the Climate Change Institute at the university’s Orono campus, apparently traveled to Greenland with the CBS crew during filming of the show. Mayewski has studied carbon dioxide levels trapped in Greenland ice core samples as part of his research on global warming.

“We haven’t seen CO2 levels like this in hundreds of thousands of years, if not millions of years,” Mayewski is quoted as saying in a preview of the show posted on CBS’ Web site, www.cbsnews.com.

“It all points to something that has changed and something that has impacted the system which wasn’t doing it more than 100 years ago. It’s human activity.”

Mayewski was traveling overseas Friday and could not be reached for comment.

The “60 Minutes” episode will air at 7 p.m. Sunday.