The main environmental challenge of the 21st century is poverty. When you don't know where your next meal is coming from it's hard to consider the environment 100 years down the line.
I am on the board of corporations who contribute both to environmental problems and their solutions. And I am on the NGO side: the Earth Council and other organizations.
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Address these environmental issues and you will address every issue known to man. And we keep dabbling in things that aren't really that important in the long term.