An analysis of water tested downstream from mountaintop removal mining operations in Appalachia shows high levels of toxins, with some samples testing 50 times the U.S. safety guidelines, according to a report by the U.S. Environmental Protection Agency (EPA). The independent analysis of previously unreleased data suggests that 14 of 17 sites tested in West Virginia and Kentucky in 2007 and 2009 exceed federal standards for toxins such as arsenic, lead, mercury, and chromium.

In China, however, a heavy environmental price is being paid for the production of “green” lightbulbs in cost-cutting factories.

Large numbers of Chinese workers have been poisoned by mercury, which forms part of the compact fluorescent lightbulbs. A surge in foreign demand, set off by a European Union directive making these bulbs compulsory within three years, has also led to the reopening of mercury mines that have ruined the environment.

Preliminary water tests from rivers near a huge coal ash spill in Tennessee show elevated levels of pollutants such as mercury and lead, a environmental group said on Friday.