Canada will phase out older coal-fired power plants to cut the country’s greenhouse gas emissions, Environment Minister Jim Prentice said on Wednesday, as it moves to make natural-gas fired plants the new clean-power standard. The new standards, expected to be firmed up by early 2011, will force electricity producers to phase out older, high-emitting coal-fired plants and require newer facilities to match the lower greenhouse-gas emissions of more efficient natural-gas fired plants. Canada has 51 coal-fired units producing 19 percent of the country’s electricity and 13 percent of its greenhouse gas emissions. However, 33 of those plants will reach the end of their economic lives by 2025. Unless the operators make substantial investments to cut emissions from the aging facilities, they’ll be required to shut down.