Welcome to James Call: Expert. I am smarter than you and I'm going to tell you how it is. Shut up and listen.
Reader "Amy" asks: "is global warming man made?"
Does the Earth have natural heating and cooling cycles? Yes, of course. However, they occur over HUNDREDS OF THOUSANDS OF YEARS.
Meanwhile, the increasing pace of icecap melting directly correlates to the amount of man-made carbon in the air. Carbon traps heat and melts shit and fucks us up. It's well documented.
The "scientists" who dispute this are crackpots and/or paid off by special interests. It's that simple.
EDIT: Ha ha, reader "Liz" informs me that I shouldn't refer to the scientists who dismiss the manmade nature of global climate change (not warming ... I just prefer to use "warming" 'cause I was raised with it) as "crackpots," or even paid off. And it's true, I'm being a little harsh. After all, the Earth does seem to heat up significantly and cool down about every 100,000 years, and the last time it was really hot was about 100,000 years ago. Nonetheless, the significance of the change within ONE CENTURY, which is a blip in terms of the Earth's timeline, would seem to indicate that the large amount of carbon in the air, belched out by indsutry, has heated our world significantly.
But that's not to say that everywhere is just going to get HOT, which is the problem with the term "global warming". Global Climate Change is the correct term, because what's really going to happen is the weather is going to get more intense.
RECOMMENDED READING: Any basic science textbook. Plus, watch "Nova".