Star: In his announcement Friday that he will not approve the proposed Keystone XL pipeline, U.S. President Barack Obama is signalling to world leaders his determination that more ambitious goals be set for confronting global warming at the upcoming climate-change summit in Paris next month.
In that cause, Obama has a kindred spirit in Justin Trudeau.
The new Canadian PMs support for the Keystone XL has been tepid at most. And Trudeaus own plans for the Paris summit are unprecedented: He has recruited...