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For now, please consider the below: 

"At the descriptive level, certainly, you would expect different cultures to develop different sorts of ethics and obviously they have; that doesn't mean that you can't think of overarching ethical principles you would want people to follow in all kinds of places." -- Peter Singer 
 

The destruction to the environment, locally and globally can partly be seen here:

http://www.veganoutreach.org/whyvegan/resources.html