Global Warming As A "Myth"

After researching the different causes and effects of global warming, I ran into a website that states different reasons supporting the fact that global warming is a myth. Although these statements contradict many of the arguments supporting global warming, there is always an opposing side to every argument. There will always be someone in this world that will say "well this isn't true." Here are some of the arguments opposing the validity of global warming on this planet. Anti global warming advocates state that scientists have not observed any significant change in the increase of global temperature. I find this claim to be vague. And I quote myself, "that scientists have not observed any significant change in the increase of global temperature." So there is a change in temperature, but it's not significant? Who determines what's significant and what's not significant. There is an obvious change in the Earth's surface temperature, and one can notice due to the rise in sea levels which result from melting glaciers. There are several prestigious institutions that can justify the increase in the Earth's surface temperature. Look, just because Al Gore was a primary advocate for global warming doesn't mean that the theory is false. I believe that many people relate the idea of global warming to Al Gore, thus ignoring its overall importance, and long-term consequences.

CITATIONS
http://www.globalwarminghysteria.com/ten-myths-of-global-warming/