Environmental restrictions on the US government’s purchases of fuel could leave it vulnerable to a trade dispute with Canada and other exporters of oil extracted from hard-to-reach deposits.
The new rules prohibit the US federal government from buying fuels that emit more greenhouse gas during their production and use than conventional petroleum-based fuel.
The issue is the latest in a string of potential and actual disputes that will test the ability of the rules of the world trading system to -regulate highly contentious global warming issues.
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