Global warming is a fact: and it is also a fact that it is caused by humans. While glaciers were already melting before we started polluting the air, their melting has been unusually fast recently. Bottom line: It's happening a lot faster than it has before. That is what Global Warming is.
An indication that is caused by us? One thing I can name is the giant hole that has formed in the Arctic's Ozone layer. That was caused by us.
After reading articles for and against global warming, I have become a skeptic about global warming. hasnt the world always been changing climate? the middle ages experienced a period of significanr warmth, and then in the 1300's it got much colder. the 1700;s is known as the little ice age, and then it has been getting warmer ever since. glaciers and the artic sea ice were melting long before " green house gas etc". it is possible that human activity plays some part in climate change, but this only contributes to a natural process I think. this is a very controversial subject, so if any one has evidence in the contrary, plaease say so! i will do my best to keep an open mind.