I feel that this is a good place to discuss remediation techniques for polluted landscapes.
There are many different methods which have already been developed, and many more are being researched. Bio-remediation, myco-remediation, and ecosystem restoration can all be used to restore large scale damaged ecosystems.
http://en.wikipedia.org/wiki/Environmental_remediation
Recently I found out about the quarry life project. It is a group which collected research from around the world on how to restore quarry life. The projects are here:
http://www.quarrylifeaward.com/projects
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