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current trends and environmental challenges, environmental policy trends and challenges, current trends and emerging challenges, environmental changes and challenges, current challenges in environmental policy, list of environmental challenges, biggest environmental challenges right now, environmental challenges in the world, environmental issues and challenges, challenges and future trends, emerging trends and challenges, united states environmental challenges, challenges for our environment, environmental change and challenge, environment issues and challenges, challenges with the emerging trends, what challenges are facing the environment, key challenges facing the environment