The concept of securitization is generally associated with the Copenhagen school of security studies, which is generally taken to include Ole WÃ¦ver, Barry Buzan, and a range of other, more loosely associated, researchers.
Average annual number of employed coal miners in the United States, 1890-2014. US employment in coal mining peaked in 1923, when there were 863,000 coal miners. Since then, mechanization has greatly improved productivity in coal mining, so that employment has declined at the same time coal production increased. The average number of coal mining employees declined to 65,400 in 2015.
Coal mining deaths on target for record low in 2015. U.S. coal mines are set to see their lowest on-the-job death total on record this year. The Associated Press reported Tuesday that only 11 miners have died in American coal mines in 2015. The previous record for fewest deaths was in 2014, when 16 people died.