Global Warming isn't a HUGE deal, I mean, it happens all the time.
Global warming certainly happens all the time. Anthropogenic global warming - human created - happens, well, never before, and considering how fast the temperatures are rising in comparison to the previous increases, and how far, this is certainly a HUGE deal.
The ice age happens, the Earth cools down, when the ice age ends, it warms up (where we are now), and then it starts over.
However this process takes THOUSANDS of years, sure humans probably sped it up by a TAD.
Look at the graphs posted above. It's A LOT more than "a TAD".
So, it's not a huge deal.
If the planet's average temperature rises 15 degrees fahrenheit in the next century
This hasn't happened, ever. Variation hasn't been more than a few degrees. If the global temperature truly did increase by 15 degrees, we'd be in big trouble.
by then people won't really notice the difference because of the evolution our body goes through to adapt to this.
I'm NOT saying we're going to be a different race in a 100 years, just that we will tolerate the heat a bit more.
That's not how evolution works. It happens over thousands, millions of years. 100 years will do virtually nothign to the heat tolerance of the human race.