An artist’s rendering of what the new Minnesota Vikings stadium will look like. (The Associated Press)

The Audubon Society is not happy about the design of the new Minnesota Vikings stadium, which is set to open in 2016. The organization, whose mission is to conserve wildlife ecosystems and, specifically, birds, started a letter-writing campaign to get the NFL team and the Minnesota Sports Facilities Authority to re-think the type of glass it chose build some walls and the roof:

The new Minnesota Vikings stadium is primed to become one of Minnesota’s biggest bird killers unless quick action is taken. … The planned building features nearly 200,000 square feet of glass (that’s 4 football fields of glass walls!) and is sited near a major bird migration pathway along the Mississippi River corridor. This decision is a death warrant for birds. This is a billion dollar stadium, and the cost to save thousands of birds by using bird safe glass could cost about one-tenth of one percent of that.

The suggested subject line of the Audubon Society suggests letter-writers use is “Don’t fumble on bird safety.”

In a news release, the organization notes that up to 988 million birds are killed annually in the United States because of collisions with buildings, and especially glass windows.

“Hundreds of millions of dollars of public money is going to build this stadium, and we know the people of Minnesota do not want their money killing birds,” Audubon Minnesota Executive Director Matthew Anderson said in a statement. “The Vikings recently approved spending millions and millions of additional dollars to make sure the stadium is ‘iconic’ — surely they also want to make sure it’s not a death trap. We’re asking them to change their minds and do the right thing.”