You can go to the DCNR website and learn about forest certification. You will see that Greenpeace is a founding member of, and sits on the board of the Forest Stewardship Council, the international certifiying body. The Chairman is Grant Rosoman, a New Zealanderwho represents Greenpeace.
http://www.fsc.org/en/about/governance/board_directors
If you still have a problem seeing the connection, I don't know what to add.
Here is a quote from our DCNR:
http://www.dcnr.state.pa.us/forestry/certification.aspx
Environmental groups such as the World Wildlife Fund, the National Wildlife Federation, Greenpeace and the Natural Resources Defense Council agree that forest certification encourages sound forest management and is good for forest conservation.
and from Greenpeace:
http://www.greenpeace.org/usa/campaigns/forests/solutions-to-deforestation
Forest Stewardship Council
The wood products we do use should come from forests that have been managed in an ecologically and socially responsible manner. The best means for determining whether wood products come from such forests is to look for the FSC label. FSC, the Forest Stewardship Council, is an international non-profit association that issues certificates for well-managed forests.
Greenpeace is a founding member of the FSC and is active in its development at the international, national and regional levels. For more information, including resources on where to find FSC products, visit
www.fscus.org.