Talk:Pulverized coal-fired boiler

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Is there a source to say that "half the world's electric supply" is covered by pulverized coal boilers? Because the source at the bottom of the article only says that "pulverized coal boilers cover half of the U.S.A. electric supply" or something to that effect; and U.S.A. certainly isn't the entire world. If there is such a source, which I'm sure there's gotta be, it would be good to include it. —Preceding unsigned comment added by 186.78.241.158 (talk) 23:29, 9 May 2011 (UTC)