Coal consumption by China's power companies soared nearly 18 percent in the first half of this year from a year ago, a state news agency said Wednesday, despite rising concern about pollution and efforts to promote cleaner energy sources.

U.S. coal mining companies, which for years have been branded the bad guys of global warming, are fighting back. They are questioning not only the science but also the motives of some of the big-name corporations who have made well-publicized commitments to cleaning up their act.

Backers of coal-based liquid fuels say they can help reduce US dependence on imported oil. Critics contend the use of coal in any form would lead to increased greenhouse gas emissions and other harmful environmental effects.

Australian professor lists the solutions he believes will emerge in reaction to climate change.