CO2 levels should be a concern though since it's causing global average temperatures to rise too quickly. 

The boreal forest in north america has evolved to expect significant snowfall over the winter which melts in the spring and feeds rivers, lakes and the soil keeping the forest moist. The last two winters have been absolutely mild with little snowfall. It's actually insane. I grew up in Northern Ontario where snow begins to fall/accumulate in early November and stays until late May. At the peak of winter we have 8ft snow banks. Snow mobile season usually lasts from early December to April. The last two years, its been a few weeks. There was so little in winter 2022 and so little rain in spring 2023 that we had major forest fires throughout northern Ontario and Quebec with smoke affecting daily life all the way to New York City! I know forest fires are normal but those very mild winters (that I have never seen in my life, nor has my father or his father) are causing forests to dry up which impacts so many things. And then warmer air means warmer oceans and that greatly affects ocean currents and marine life... You see where I'm going with this?