From PBS Terra.

You’ve heard of saving the bees, but have you heard of rerouting a highway for them? In Washington’s Walla Walla Valley, traffic and pesticides began threatening the survival of ground-nesting alkali bees, vital pollinators for alfalfa crops. Human Footprint host Shane Campbell-Staton meets entomologist Doug Walsh, whose surprising and effective solution is helping safeguard low-flying bees and the farmers who rely on them.