Ontario has never wanted to leave Canada. However, northern Ontario has wanted to split from southern Ontario and form its own province within Canada. Source: I was born and grew up in northwestern Ontario and there was a fair amount of dislike of southern Ontario, but also strong pro-Canadian sentiment. In summary:

Resource Revenue - Northern residents feel local profits from mining, forestry, and hydro generation are siphoned to Southern Ontario with insufficient local reinvestment.

Transportation & Services - Higher gas taxes, highway maintenance backlogs, winter road safety, and limited transit (e.g., the elimination of Trans-Canada Greyhound bus service. Many small towns on the Trans-Canada highway are now almost impossible to reach without a car, without spending a lot more time and money).

Policy Disconnect - One-size-fits-all regulations designed for urban Toronto often fit poorly in northern wilderness environments.

Political Power - Northern Ontario holds roughly 10–13 provincial seats out of 124, making it difficult for northern MPs or MPPs to influence policy regardless of who forms government.

1. I would laugh my ass off if Mark Carney actually won the Nobel Peace Prize.

2. The downside would be that Trump would certainly throw the mother of all temper tantrums, and possibly order a military invasion of Canada.

3. Mark Carney really has not done anything yet deserving of a Nobel Peace Prize (although that might change if he is as successful in founding a newer world order as he hopes, including robust climate change measures).