[thedoc (OP)]

l. klein asked the Naked Scientists:
   Concrete Jungles July 11 2016 - your mention of 'brown fields' did not mention 'contamination' . That is central to the definition by the U. S. Environmental Protection Agency....sorry, you cannot view external links. To see them, please REGISTER or LOGIN  The presence of contamination may have impact on reuse of these areas. Chernobyl is interesting example of a brown field.
What do you think?