Coal fires are a global disaster, said Associate Professor Glenn Stracher of East　Georgia Collage in Swainsboro, USA. But ______ (54) few people know about them.

　　Coal can heat up on its own, and eventually catch fire and burn, if there is a continuous oxygen supply. The heat produced is not caused to ______ (55) and　under the right combinations of sunlight and oxygen, can trigger spontaneous (自发的)　catching fire and burning . This can occur underground, in coal stockpiles, abandoned　mines or even as coal is transported. ______ (56) fires in China consume up to 200　million tons of coal per year, delegates were told. In ______ (57), the U.S economy　consumes about one billion tons of coal annually, said Stracher, ______ (58)　analysis of the likely impact of coal fires has been accepted for publication in the International Joomal of Acoal Ecology. ______ (59) underway, coal fires can burn for　decades, even centuries. In the process, they release large ______ (60) of　greenhouse gases, poisonous fumes and black particles into the atmosphere.

　　The members of the panel discussed the ______ (61) these fires may be having on global and regional climate change, and agreed that the underground nature of　the fires makes them difficult to ______ (62).

　　Ultimately, the remote sensing and other techniques should allow scientists to　______ (63) how much carbon dioxide these fires are emitting (释放) 。 One suggested ______ (64) of containing the fires was presented by Gary Colaizzi, of　the engineering firm Goodson, which has developed a heat-resistant grout (灌浆)，which　is designed to be pumped into the coal fire to ______ (65) the oxygen supply.

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