I should point out we are currently still in the last ice age.
Its also important to realize in the last 4.5 billion years or so, the Earth has gone thru multiple ice ages and warming periods.
There is evidence in core samples, ice samples and sedimentary buildup such as lime and sandstone.
One should also realize the Sun is roughly 4.8 billion years old and is rising into its main sequence phase. Yes, the Sun is getting hotter.
The Earth is also slowing in its rotational period causing longer days.
We can't tell because we live and die over very significant short time periods by comparison.
Our entire modern science is at best, a couple thousand years in total.
In other words, we are very new on the scene.
Granted, our 7.7 billion population and our incessant need to pave the planet are not helping matters but I assure y'all, we are not the cause.
Here...Lemme say it again?
One of the problems with human reasoning is to imagine that we are significant to the natural process of life.
Hahaha, delusions of grandeur.
Just for a second, a considerations, is it possible that humans, existing for a mere 2 million years might have no idea what is really going on in a Universe that has existed for 14 billion years or so?
How could any person understand what is really going on?
Bur wait, put yer ego aside for a second.
The question to ask is why?
Why, in the world would we, who can't understand our own brains or the planet we infest, why would WE be so freaking special we have all the answers?
Sorry, that just makes ABSOLUTELY no reasonable sense?
So lets just say, we are infants learning the world in which we inhabit.
Lets figure that everything we know, all we have 'found out' about the Universe is but an infants view on the actual reality out there?
What happens then?
What if what you think you know is not what is actually happening but only how we understand it according to what we have learned so far?
Our reasoning approximates about 2,000 years, Pretty significant to a species that lives about 100 years.
The Universe approximates to 13.8 billion years.
Do you even realize how many 2,000 year periods are in 13.8 billion years?
The significance is the determining factor not a strange detail.
We Know NOTHING!
Hell, ya can't even control your own population, understand your own planet or contemplate the vast dynamics of the Universe in which you exits.
2 million years your species has been around.
Eventually, some far superior life form will consider Humans as a short lived fluke in the evolutionary past of this planet.
LOL, talk about delusions of grandeur!