SAN DIEGO (CBS 8) - Volunteers from a local biotech company began planting 1,000 trees at a local nature preserve Monday morning. 

Two hundred employees from Takeda California took part in Monday's project along the San Diego River Trail. Their goal is to plant 1,000 trees by the end of the day. Over the last few years, the group has planted 4,000 trees in an effort to improve the quality of the river park. 

Takeda California is a biotech company and for the last several years, they have worked with the San Diego River Park Foundation to help plant 4,000 trees along the river trail.