It depends, if it is cost efficient to do so. For example, at the moment, the world is mostly reliant on petrol as a fuel source. It is generally agreed, that petrol extraction and refining costs major damage to the environment in the form of oil spills, soil erosion and general environmental harm. However if you were to fix this, there would be no way to do it. The technology does not exist to cleanly extract and refine oil. The money to clean up oil spills would be too much for companies to stomached. In the meantime, there is a huge market for renewable energy and alternative fuels which a lot of companies are attempting to take advantage of. For example, the Prius is such a fine statement of capitalism's ever fluid force to go where the money is. It goes both ways. This is one of the main reason why the environmental summit at Copenhagen didn't work out. A lot of emerging nations like China and Brazil disagree with developed nations like the U.S. on carbon targets.

First notebook entry: Introducing myself

I am from the city of Chongqing. 

Having Fun!

Lately,I have met some great guys here .They are so wonderful so I've realized I am so lucky. 
I've become more and more interested in English, and would love to hang around here to practice my poor English. This place is really useful and funny.
I love this place....

"Flesh and Blood" is an idiom that describes one's relatives and family because of the link through blood. It is commonly used to refer to one's children though.