Asked about the economic analysis behind President Barack Obama’s energy regulations, Murray said, “There’s no scientific analysis either. I have 4,000 scientists that tell me global warming is a hoax. The Earth has cooled for 20 years.”

Asked for clarification, a spokesperson for Murray Energy sent links to the Manhattan Declaration on Climate Change, which says “human-caused climate change is not a global crisis,” and the Global Warming Petition Project, a list of science degree holders who don’t think humans cause climate change.

Murray’s claim that there is no scientific analysis behind climate change is not true. A landmark 2013 study assessed 4,000 peer-reviewed papers by 10,000 climate scientists that gave an opinion on the cause of climate change. It showed 97 percent of the authors attributed climate change to manmade causes.

His second claim that Earth is cooling is also false.
Temperatures were the warmest on record last year, according to NASA and the National Oceanic and Atmospheric Administration. It was the third year in a row global average temperatures set a record. http://www.cnbc.com/2017/02/17/murray-energy-ceo-claims-global-warming-is-a-hoax.html

UPDATE Oct 26, 2020

U.S. coal baron Robert Murray, an ally of President Donald Trump and a leading industry voice who called global warming a hoax, died on Sunday at the age of 80.

References

• Coal: A Long History of Subsidies http://www.taxpayer.net/library/article/coal-a-long-history-of-subsidies
• Federal coal subsidies http://www.sourcewatch.org/index.php/Federal_coal_subsidies
• Mining Coal, Mounting Costs: The life cycle consequences of coal http://www.chgeharvard.org/resource/mining-coal-mounting-costs-life-cycle-consequences-coal
• Murray Energy Corporation http://www.sourcewatch.org/index.php/Murray_Energy_Corporation
• Donald Trump overturns law preventing companies dumping coal mining debris in streams and rivers
  http://www.independent.co.uk/news/world/americas/donald-trump-coal-rivers-regulation-scrapped-law-a7584916.html