So....? maybe things will get as warm as during 1100 BC....and maybe not...
(those SUV chariots really heated things up back then...

)
my point remains.....
our planet has been and is subject to NATURAL swings in temperatures.....nothing to get your panties in a twist about.....despite the hysterics of Al Gore and other libs who just want to tax the hell out of you...
You mention that our planet has been subject to (previous) natural swings in temperature as if it's news which just so happens to negate a human cause related to current global warming. Neither is true. Climate scientists are well aware of previous warming and cooling trends. In fact, YOU only know about them because of THEIR scientific research. Odd that you trust their research when it comes to changes that took place hundreds of thousands and even millions of years ago, but you won't grant them any credibility regarding their insights into today's causes.
There's another factor: TIME. I don't mean time as in when. I mean time in terms of how fast. Today's climate change (warming) is happening much faster than previous periods because humans are pumping greenhouse gasses into the atmosphere far faster than previous periods when the changes took place over long periods of geologic time. In case you didn't realize it, that's why the current spike is so steep on the graph.