California tomato grower Casey Houweling is the first American to install a combined heat and power generation plant that will make his 150-acre greenhouse almost completely energy-efficient. The plant will use natural gas to keep the greenhouse warm, and the extra electricity it generates will be sold into the local power grid. Most notably, it will feed carbon dioxide gas, a waste product, directly into the greenhouse. The use of this gas helps increase plant growth and improve the tomatoes' flavor.
via IdeaFeed | Big Think