Extinction and ecosystem

Life on the earth has formed an exquisite and fragile balance. But in the last century, human population has exploded. An even more dramatic increase in economic activity has led to mass production, mass consumption, and mass wasting. The ecosystem on the earth has been rapidly destroyed by humans. And we keep destroying it without knowing a risk of our life. From Sixth Extinction, gNow, there are fears we are at the start of another mass die-off, but this one may be triggered by the activities of just one species - us.h (Canada & the world backgrounder, 2002, p.10) The sixth extinction has already begun by our hands.
Do you know what the dodo bird is? Dodo was a unique flightless bird which first sighted on Mauritius, an island in the Indian oceans. Around 17 century, Dutch sailors began using the island of Mauritius as a stopover; Within 80 years, the dodo was gone. Basically, why does the dodo can not fly? Here is one background, from International Wild Life, Don Boroughs said,...