91.   The explosion could have been caused either by an accumulation of methane gas or coal dust, the report said.

92.   The explosion late Wednesday was caused by a build-up of methane gas, the Interfax news agency said, quoting local mining officials.

93.   The explosion was caused by an accumulation of methane gas, the report said.

94.   The gas collection systems work around the clock, siphoning off methane gas from wells.

95.   The landfill will be tapped for its methane gas and will be the site of a wind power experiment, Abolt said.

96.   The methane gas given off by the disposal unit could be used to power the spacecraft, the scientists told the magazine.

97.   The plant could be fueled with methane gas from the landfill, supporters say.

98.   The resulting methane gas given off by the disposal unit could then be used to power the spacecraft, the scientists told the magazine.

99.   The Skochynskoho mine is one of the most modern in Donetsk, but it is dangerous for high volumes of methane gas.

100.   Thousands of poor people are cooking on methane gas that is seeping out of a huge garbage dump, and environmentalists warned Tuesday that it could soon explode.