Fault is a personal conclusion of mine, but he was the biggest and possibly sole driver behind the way the climate change policies and the carbon taxes were pushed, as well as likely a lot of ministerial foot dragging on various environmental assessments and other issues, where the focus was on the environment regardless of the impact on Canadians and Canadian businesses.
If it was up to him, all the oil would stay in the ground, which is fine in theory if you completely ignore that pretty much every advance in the industrial revolution onwards and the entire information age relies heavily on petrochemicals.
Emission controls on vehicles and industries, investment in cleaner energy (like nuclear mini and micro energy), etc all have a real and measurable impact on Canadian emissions than the punitive approach he tried to take, and is being walked back because it is a shitty way to do it.
Things like EV tax credits, home energy improvement programs, emission improvement tax credits for industry etc are actually pretty effective in real terms. One big win generally is the planned upgrade of the national energy grid which is long overdue, and needed EV or not to support growth, but a very real measure the government can do on the infra background that actually enables a lot of things that will actually make a difference.