SALEM, Ore. (AP) - Seven Western states have joined four Canadian provinces to plan limits on greenhouse gas emissions.

It would cover up to 90 percent of the global warming emissions across Oregon, Arizona, California, Montana, New Mexico, Utah and Washington and would extend to British Columbia, Manitoba, Ontario and Quebec in Canada.

The plan was drafted by the Western Climate Initiative, a group created by Oregon Gov. Ted Kulongoski with California Gov. Arnold Schwarzenegger and Washington Gov. Chris Gregoire in February 2007.

In Oregon, it will affect fewer than 10 utilities and about 50 companies that put more than 25,000 metric tons of carbon dioxide each year.

The plan was released Wednesday in San Diego.