India, the world's third largest emitter of greenhouse gases, warns its emissions could triple over the next 15 years as it expands coal-fired electricity generation to power a developing economy.
Microsoft heavyweight Bill Gates is staging a multi-billion green intervention on Nov. 30 - a potentially huge shot in the arm for the Paris climate talks on their first day.
"We'll demonstrate that we are serious about climate change," Trudeau said following a four-hour working dinner with provincial and territorial leaders.
First minister's meeting is not expected to produce any new national target for reducing emissions - but will set a fresh tone for Canada one week before Paris.
Curbs on oil sands emissions and an end to coal power by 2030 are the key planks of a new, greener, Alberta in a groundbreaking announcement by Notley's government just days before Paris talks.