Unfortunately (or fortunately for the millions upon millions of taxpayers dollars being funneled towards them), the IPCC was caught with their pants down creating fraudulent data points and deleting every other data point that didn't fit their graphs. I know nothing about the website you linked to but the place they're getting their information from is 100% fradulent. I'm open to hearing about man caused Global Warming but to date have not seen one scientificly rigorous, peer reviewed study that hasn't been rocked by scandal (famous hockey stick graph, East Anglia emails, etc).
Here is a link to one of many, many articles about it:
Here is a great quote from the linked article about the so called "science" and open mindness that goes on that the IPCC:
Ya like i said, i didnt wanna use that bc i know someone was gunna prove it was BS somehow but there are similar charts provided by more accurate sources.