There has indeed been global warming. But significant shifts have happened historically at similar pace to what has happened due to modern climate change.
This has occurred throughout human history without pollution.
In point of fact, even with the current global warming, we are significantly cooler than many points in our history
So while there has been a significant chance since we started monitoring, its not the first time or even most significant climate change that has occurred.
But what's even more important to note is that the temperature of the planet actually has not changed appreciably in a decade. (Source: US National Center for Environment)
There were indeed decades of abrupt climate warming, but this has slowed and debatably stopped over the last decade.
There are many reasons we should be switching away from fossil fuel use to renewable energy (pollution, depletion, etc), but global warming is an aspect of the fact that we've only started having the ability to monitor these changes in the last 100 years, and watching numbers change in real-time is very different than the majority of human history.
We'll only be able to look back at this to determine whether this was really soley due to pollution/human effects, or part of the normal varriation of the planet, but the vast majority of "climate change projections" are based off the data from the 80s (or 50s) through 2007.
Its almost impossible to find projections based on 2007 and after because they don't fit the narrative.