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Mercury is most commonly recognized as a developmental toxin, threatening to young children and fetuses as they develop their nervous system. Prenatal exposure to even low levels of mercury can cause life-long problems with language skills, fine motor function, and the ability to pay attention.
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Healthy forests and wetlands stand sentry against the dangers of climate change, absorbing carbon dioxide from the atmosphere and locking it away in plants, root systems and soil.
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The Pacific Remote Islands Marine National Monument may be distant from our shores, but it will help us understand how healthy marine ecosystems work and how we can revive troubled seas closer to home.
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I have visited people whose health has been endangered by tar sands oil. I have watched neighbors struggle to recover from Superstorm Sandy. I have seen solar panels and wind turbines become an increasingly familiar part of the landscape.
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As heat rises, so does the number of people trying to cool down homes, schools, hospitals and businesses. This isn't just about comfort; it's a matter of public health.
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Countries have made impressive pledges to cut carbon pollution, but we have to ensure these promises become actions.
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Putting a tax on carbon could be an effective approach for curbing global warming pollution.
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Declaring the San Gabriel Mountains a national monument will make this natural wonder more accessible. It will welcome people from all walks of life and maintain the mountains' wild character at the same time.
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Whether it is salt farmers in India embracing solar power or wind companies creating tens of thousands of jobs in America, people are providing a vision for the clean energy future.
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Wind and other clean, renewable energy will help end our reliance on fossil fuels and combat the severe threat that climate change poses to humans and wildlife alike.
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The San Gabriel monument expands our natural heritage, but there is more in need of safeguarding - extraordinary places like Utah's Greater Canyonlands.
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Every year, tens of millions of salmon return to the pristine shores of Bristol Bay in Alaska. They linger in the bay's cool, shallow waters before charging up nearby streams to spawn and create another generation of wild salmon.
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The truth is you can't get more water from reservoirs that are empty.
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Our nation has abundant clean energy resources, and tapping them will generate jobs, make the air safer to breathe, and tackle climate change - the greatest environmental crisis of our time.
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When the government undertakes or approves a major project such as a dam or highway project, it must make sure the project's impacts, environmental and otherwise, are considered. In many cases, NEPA gives the public its only opportunity to be heard about the project's impact on their community.
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Though every nation must do its part to address climate change, developed nations are responsible for the lion's share of carbon pollution in the atmosphere, and they have an obligation to help developing nations transition to a sustainable future.
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Safer chemicals and more energy-efficient technologies can provide cooling without severe climate implications. Shifting to these alternatives could avoid the equivalent of 12 times the current annual carbon pollution of the United States by 2050.
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Americans are already paying the price for record heat waves, dirty air, and an unstable climate. We need to fight these threats with every weapon we have, and the electricity industry has to do its fair share.
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Americans are worried about pollution - oil trains running through their towns, fracking in their neighborhoods, coal dust in their air. They're worried about what the future will look like for their children if carbon pollution continues unchecked.
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The oceans produce up to 70 percent of our oxygen, they shape our climate, and they support an American oceans economy larger than our nation's entire agriculture sector.
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Mercury is a potent toxin that interferes with the human nervous system. Reducing this hazard will be a major public health breakthrough.
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VW has held a beloved place in American culture. When I graduated from college, many of my friends drove across the country, and most hit the road in a VW van or Bug. Through the years, these cars have represented youth, freedom and quirkiness.
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Many environmental battles are won by delaying a destructive project long enough to change the conversation - to allow new economic, political and social dynamics to emerge.
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From reinforcing beaches in the Rockaways to installing generators at the Coney Island Houses and sealing holes in the subway system, New York is fortifying our ability to withstand future storm surges.