In theory, the world's largest industrialized democracies have agreed to stop using fossil fuels within a little over a quarter-century and to switch to new sources of power such as solar and wind as fast as they can.But as leaders of the Group of 7 gathered in Hiroshima, Japan, this weekend for their annual meeting, some countries were wrangling over whether to loosen commitments to phase out the use of carbon-emitting fuels like gas and coal in time to avert the worst effects of global warming.
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