vesicles
Colonel
global warming could be caused by just natural change in temperature or human factors.
Yep. People say that the climate on earth fluctuates greatly. The past ten thousand years of mild weather is actually very unusual, which has allowed creatures like human to thrive. No one knows whether global warming we are seeing is simply our mother earth getting back to her old self, or man-made. It's possible we are heading to the next ice age, which is the normal and natural pattern for earth climate changes.
I think the term "global warming" is misleading although the initial stage is warming of the planet. The end would be global chaos: extremely hot south (hurricanes and typhoons) and extremely cold north (snow storms and blizzards all year long and becomes uninhabittable), which is bad news for most people since most of the people live in the northern hemesphere.