Mass Extinction?

After reading the arguments for and against the idea that we are living in a time of yet another mass extinction, I'd have to say I don't believe we are. The jurassic period and other periods show great changes in the climate and environment. Whereas, although we are experiencing signs of global warming, at this point i'd have to say it isn't to the degree of the aforementioned periods. We are experiencing changes but not to the degree of total annhilation of the populations, clearly. We should not dismiss this though. As with other important issues, we as humans can begin to change our way of living to preserve our environment and our animal friends as well. If survival is important to us, we's better begin to see extinction as imminent if we turn a blind eye to it now.