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OTTAWA — Doubt is percolating about Canada’s ability to deliver on its two biggest environment commitments at this week’s G7, with no agreement yet on a plastics waste charter and Canada’s recent pipeline purchase casting a pall over its commitment to climate change.

Environment Minister Catherine McKenna said Tuesday it is still uncertain whether Canada will get its proposed zero plastics waste plan signed at this week’s G7 leaders summit.

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Speaking at the Canada 2020 conference Tuesday in Ottawa, McKenna said most of the negotiating has already taken place, but she was unable to say if all the G7 leaders will sign the charter when their two-day meeting in Quebec gets underway Friday.

“Who knows at the table what happens,” she said. “I’m optimistic.”

In January, Prime Minister Justin Trudeau said he would make plastics and a zero-waste plastics charter a key deliverable as part of Canada’s G7 presidency. The wording of such a charter has been in the works for months one goal is to set a target date for eliminating plastics from landfills, as well as commitments from each country on how to get there.