Stream, Download and Share
Hans Herren believes that more scientists need to study the biology of the soil -- its mix of insects, bacteria, and microbes -- and explains how this can help the small farmer.
© 2016 PBS & WGBH Educational Foundation.
All rights reserved.
You must be logged in to use this feature
Assign directly to your students using the code or link above, without having them log in. Simply tell your students to go to
www.pbsstudents.org and enter the Assignment Code, or click on the Assignment URL to share the assignment as a link.