When was the “peak” of coal, or is it still in the future?

In 2016 experts estimated that China, the world's largest coal consumer, reached peak coal in 2013, and that the world may have passed peak coal. However, in 2017, for the first time in four years, demand for coal rose. As of 2015, China accounted for 50.0 percent of world coal consumption.

Explanation:

accelerated heartbeat, raise in blood pressure, slow in digestion, raise in blood sugar and perspiration. (myers' psychology for ap 2nd edition pg 87)