Coal mining increase over the previous 25 years. In 2006, the world production of brown coal (lignite) was slightly over 1,000 Mt, with Germany the world's largest brown coal producer at 194.4 Mt, and China second at 100.6 Mt. Coal production has grown fastest in Asia, while Europe has declined. Since 2013, the world coal production is decreasing, -6% in 2016. The top coal mining nations are: Most coal production is used in the country of origin, with around 16 percent of hard coal production being exported. Coal reserves are available in almost every country worldwide, with recoverable reserves in around 70
What If?: Serious Scientific Answers to Absurd Hypothetical Questions What If?: Serious Scientific Answers to Absurd Hypothetical Questions What If?: Serious Scientific Answers to Absurd Hypothetical Questions is a non-fiction book by Randall Munroe in which the author answers hypothetical science questions sent to him by readers of his webcomic, "xkcd". The book contains a selection of questions and answers originally published on his blog "What If?", along with several new ones. The book is divided into several dozen chapters, most of which are devoted to answering a unique question. "What If?" was released in September 2, 2014 and was received positively by critics. In the introduction section of