Thể hiện khả năng dữ liệu môi trường ngoại hối và xu hướng quan tâm đến chất gây ô nhiễm Các nhà khoa học và hoạch định chính sách là rất quan trọng để hiểu các lợi ích của quá khứ và tương lai hành động điều tiết và tự nguyện. Trong khi có Will Always Be không chắc chắn liên quan đến xu hướng quan sát và lợi ích tiềm năng của hành động khắc phục hậu quả, chất lượng cao dữ liệu môi trường sẽ Tăng cường quản lý và khả năng phát triển chính sách. Ngoài ra,. | 6 An Integrated Framework for Ecological Mercury Assessments Tamara Saltman Reed Harris Michael W. Murray and Rob Reash INTRODUCTION Environmental data capable of demonstrating changes and trends in contaminants of concern to scientists and policymakers are crucial to understand the benefits of past and future regulatory and voluntary actions. While there will always be uncertainty associated with observed trends and the potential benefits of remedial actions high-quality environmental data will enhance management and policy development capabilities. In addition defensible environmental trend data are needed to assess the benefits society receives or can expect to receive in return for the resources invested in pollution control measures. In short without good environmental monitoring we may never know if we are making sound stewardship decisions. Mercury Hg contamination is widespread in water in surficial soils and sediments and in the tissues of plants and animals in ecosystems around the globe. Once deposited to terrestrial and aquatic ecosystems some inorganic mercury is transformed into methylmercury MeHg a highly toxic compound that bioaccumulates efficiently in food webs Wiener et al. 2003 . As a result of the toxicity of MeHg to wildlife and humans many nations are interested in reducing environmental mercury contamination and associated biotic exposure UNEP 2002 . While mercury is a naturally occurring element that cannot be eliminated from the environment human activities and processes have greatly increased its abundance in the atmosphere and in terrestrial and aquatic environments Jackson 1997 USEPA 1997 Fitzgerald et al. 1998 primarily by transporting this mercury from geological strata to the surface of the Earth and atmosphere . due to mining and coal combustion . One approach for reducing exposure to mercury in the industrialized world is to reduce anthropogenic emissions of the metal into the atmosphere. This has been done in some .
