Originally Posted by Robbie

How much has the temperature risen over the past 100 years. And what was it 500 years ago?

That's an interesting question if you ask me. As was brought up by someone else...the Vikings went to Vinland ("Wine Land") and they called it "Wine Land" because it was so nice and warm that grapes grew everywhere by themselves and made terrific wine.
That was around the year 1000 AD
And keep in mind they sailed there from Greenland.

All that was frozen within a couple of hundred years.

Didn't take thousands of years to do it. The Earth abruptly changed during that period as it was coming out of a "hot" period" and going into a "mini Ice Age".

So anyway...the statement you made about the past 100 years: What temperature are you starting with and from what YEAR.

The Earth isn't warmer than it was when Leif Ericson sailed from Greenland to Vinland for damn sure. It's COLDER.

So when does this temperature "rise" start? And how did the Earth get so warm back then without any "help" from mankind? And how did it cool back down to where we are today?

And don't start insulting people. Just look at my questions. I think they are very reasonable to ask.