In response, some companies have been forced to reduce costs and cut back on their workforce. For instance, Australia’s largest coal companies would shed jobs to stay competitive, the Wall Street Journal reports.

Along with its heavy 37% tilt toward U.S. companies, the Market Vectors Coal ETF includes exposure to overseas markets such as China 21.7% and Australia 10.7%, among others.

Market Vectors-Coal ETF

For more information on the coal industry, visit our coal category.

Max Chen contributed to this article.