Ok - good points.  I suspect you suffer from the First World syndrome of condemning child labour/sweat shops and such and perhaps working to end it.  The idea is great - but what is the result?  Why do so many want to work in sweat shops?  Why are four year old children working?  You need to understand those causes and have an answer or you could just make things worse!  We need mining of many kinds (Iron, nickel, coal oil etc.).  These are essential things unless you want to return to the stone age (and even they mined flint!).  The trick is to do it in a long term better way, minimize any destruction and make the effort to restore or repair damage done.  Clearly dumping toxic chemicals in the sea or rivers is bad.  So how can it be done?  What is the toxic waste - how does it get cleaned up - who's going to pay for it?  It's easy to point at problems other people have - much harder to come up with workable solutions for them though.