NFLPA Renews Call for All-Grass Fields After Aaron Rodgers Injury

NFLPA cites studies showing higher injury rates on artificial turf compared to natural grass.
Players overwhelmingly prefer natural grass fields based on safety concerns and feel.
Transition to grass would require investment in upkeep but could help prevent injuries.
Some players, coaches, and agents voice support for all-grass fields after Rodgers' season-ending torn Achilles.
NFL commissioner says surface decisions will continue to be based on scientific research and data.