In the United States alone, approximately 40 coal-burning electricity plants produce more CO2 emissions than any similar facility in Canada. Natural gas is part of the transition story as cleaner sources of energy are developed: Replacing just one 500 megawatt coal-fired power plant with LNG fueled power generation for one year would equate to taking 557,000 cars off the roads.
For some useful lists of showing where the most coal is being used today, and some ideas for how LNG could help to change that, check out this site.