The tire has been around for approximately 200 years — not as long as the wheel, though even that mechanical marvel has been around for only about five to six thousand years . Even so, the tire has had several tweaks and design variations over the years. Now, as the number of used tires pile up , scientists are working to develop more sustainable tires to protect our vehicle’s wheels and the surface of the road. A New Spin on Tires An ambitious approach to the problem of making tires green is going beyond the figurative use of the word “green.” During the 2018 Geneva International Motor Show, Goodyear revealed the design for their Oxygene concept tire . The design incorporates live moss inside the tire, which picks up moisture from the road via its tread structure and has a clear panel to allow photosynthesis to occur. This process lets the moss process CO2 from the air into oxygen. In addition, an energy generation system built into the tire draws electricity from the process of ph...