sustainable Green Visions: your chance to have a field day at the farm By Lisa Johnson • Jun 6, 2018 Clover Valley Farms Apples and rabbits and sheep - oh my! Clover Valley Farms is giving farmers, gardeners of the merely curious a chance to tour their organic, sustainable acres this weekend. Grow your own ... tires? By Lisa Johnson • Aug 2, 2017 nrg_crisis/Flickr Can you make car tires from trees and grass? University of Minnesota researchers can. They've discovered a new way to make isoprene (a key molecule in car tires) which means the tires made from biomass would be identical to the tires we're using now - the ones made primarily from fossil fuels.