Meet Mark Perry, the professor who concludes his emails with this signature:
Notice: It’s OK to print this email free of any “eco-guilt.” Paper is a biodegradable, renewable, sustainable product made from trees. Growing and harvesting trees provides jobs for millions of Americans. Working forests are good for the environment and provide clean air and water, wildlife habitat and carbon storage. Thanks to improved forest management, we have more trees in America today than we had 100 years ago.