Scientists say another planetary boundary — the environmental speed limits that warn us of a destabilizing planet — has been crossed. Greenhouse gas emissions from the burning of fossil fuels have pushed the acidity of the world's oceans past a safe threshold.

And: The Supreme Court of Canada grants a stay on the cull of about 400 birds on an ostrich farm in B.C.. The Canadian Food Inspection Agency ordered the flock destroyed last year, after tests showed avian flu in some ostriches that had died. The court is allowing the delay as the farm applies for leave to appeal the decision.

Also: One day after unexpected support from the U.S. president, President Vlodomyr Zelenskyy pleads with the United Nations General Assembly not to give up on Ukraine.

He warns Russia wants to expand its war beyond his country.

Plus: Carney challenged on public safety minister’s comments, middle school at grade six may not be good for grades, deadly shooting at a U.S. Immigration and Customs Enforcement facility in Texas, and more.