Chris Borland has recorded a public service announcement critical of the NFL for not being serious about players' health.

Borland is doing the PSA for Union of Concerned Scientists, a group that is worried that lobbyists for big business, like the NFL, convince lawmakers against passing laws protecting citizens from health concerns.

"I walked away from pro football and a $2.9 million contract with the San Francisco 49ers because I didn't want to develop CTE," Borland says in the video.

In the video, Borland says the NFL attacked the facts about CTE the same way the fossil fuel industry and the agriculture industry used anti-science tactics in their own situations.

Borland has since been invited by the NFL to see their concussion research.