The Environmental Portfolio at The Pew Charitable Trusts   For more than 25 years, Pew Charitable Trusts has been a major force in engaging the public and policy makers about the causes, consequences, and solutions to some of the world’s most pressing environmental challenges. Our environment work spans all seven continents with more than 250 professionals working at the local, national, and international levels to reduce the scope and severity of global environmental problems, such as the erosion of large natural marine and terrestrial ecosystems that contain a great part of the world’s remaining biodiversity.   Pew has worked in the United States and Canada since 1990 to protect vast stretches of wild lands and has expanded its land conservation efforts t