We're going to run out of any kind of fossil fuels, so we need to move on to a renewable source.
This is just part of a 7.2 kW rooftop solar system in Bayview, Wisconsin, as seen in 2007. (M.J. Monty/Creative Commons)
Arbuscular mycorrhizal fungi live in symbiosis with plant roots and are able to store up to 70 percent of organic carbon from leaf litter. (Mark Perkins/Flickr)