Updated

A U.S. scholar is threatening to sue NASA to compel the release of climate change data, saying he suspects the agency has manipulated research just like a university research center in Britain is accused of doing.

The Washington Times reported Thursday that Christopher Horner, a fellow with the Competitive Enterprise Institute, has given NASA until the end of the year to grant his two-year-old Freedom of Information Act request for research detailing NASA's climate data and explaining why the agency has altered its own figures.

He's referring to calculations that first showed 1998, then 1934, then 1998 and 2006 as the hottest years on record.

The threat comes after leaked e-mails from Britain's University of East Anglia's Climate Research Unit showed scientists appearing to manipulate climate data. The director of the unit has stepped down while an investigation is underway.

Horner said he suspects NASA's information is "highly damaging."

But White House scientists defended the science behind global warming on Capitol Hill Wednesday. A NASA spokesman told the Times the agency is collecting information to respond to Horner's request.

Click here to read the full story in The Washington Times.