MEDIA companies have published numerous articles on global warming and greenhouse emissions in recent years. Now, a couple of large publishers are starting to think about their own impact on the environment.

Time Inc. participated in a study published this year by the Heinz Center that calculated the amount of carbon dioxide emissions produced over the entire process of publishing Time and In Style.

Other magazine companies, including the Hearst Corporation, now say they are studying the Heinz report to consider the implications for their magazines, and Rupert Murdoch recently announced that the News Corporation is developing a plan to become entirely carbon neutral, meaning the company will reduce its carbon emissions and try to offset the emissions left over.

“We’ve recognized that these are issues that are important to our readers and, increasingly, important to our advertisers,” said David J. Refkin, the director of sustainable development for the Time Inc. division of Time Warner and a member of the board of the Heinz Center. “We’re starting to see a movement where becoming carbon neutral is something many companies are considering.”