Sep 4, 2008 | 6
The U.S. produces half its electricity from burning coal—and pumps out more than 40 percent of its carbon dioxide (CO2) emissions in the process. Vattenfall—the enormous Swedish electric company—has a similar problem, though it sources most of its electricity in that Nordic country from dams and nuclear power plants.
The company also owns a slew of dirty, old coal-fired power plants in the former East Germany. These plants burn the dirtiest form of coal, lignite (a.k.a. brown coal), which is soft because it’s still damp and produces much more polluting soot when burned.
With the onset of a new CO2 emissions trading scheme in the European Union, Vattenfall decided to build a demonstration project at its lignite-burning power plant in Schwarze Pumpe. The technology is called oxyfuel, and it basically relies on burning coal in pure oxygen and CO2 rather than normal air.
Deadline: Jan 11 2014
Reward: $20,000 USD
Conventional washing machines cause excessive damage and wrinkling to clothes primarily during the water removal step. With the introduc
Deadline: Dec 11 2013
Reward: $52,000 USD
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