TakePart: When the Soviet Union collapsed in the early 1990s, 112.4 million acres of farmland were abandoned as the country's collectivized farming system collapsed along with it. Over the next 20 years, that land became one of the largest areas in the world to sequester carbon. The region, known as a carbon sink, is equal to between 10 and 20 percent of the sequestration action of Russia's woodlands, which include vast tracts of boreal forests. Every year, the former farmland absorbs 42.6 million metric tons...