The seasons are starting to run into one another because of climate change.
This is my 63rd Winter, and I've I have experienced Winter (as well as Summer, Spring, and Fall) on every continent. The seasons have always run into each other ... it's called weather.
Earth is over 1,000,000,000 years old. 63 years is nothing. We humans are nothing to Mother Earth.
In 200 years, Summer could very well be from June until October if things are hot enough.
In fact, it's over 4 and 1/2 Billion-years-old and, in that time, has been a molten hell, a frozen ball, and back again a few times. If you say humans are nothing to The Earth, I agree. We are just one of many quadrillion life forms to roam her surface in all that time.
We would be beyond pretentious to claim that our comings and going can save, or destroy The Earth.