The more people learn about the proposed Keystone XL tar sands pipeline, the worse it looks.

California's drought affects everyone in the state, from farmers to fishermen, business owners to suburban residents, and everyone has a role to play in using precious water resources as wisely and efficiently as possible.

The truth is you can't get more water from reservoirs that are empty.

Water efficiency, recycling, and other local supplies will help California flourish in a drier future.

I have talked to people across the country struggling in the face of an altered climate. New Jersey homeowners are trying to rebuild after Superstorm Sandy. Miami government officials are trying to plan for rising seas and flooded streets. California farmers are trying to make it through the state's worst drought on record.

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.

Young people are already leading on climate action. I see it at rallies to reject the Keystone XL dirty tar sands pipeline. I see it in the push to demand justice for communities being run over by fracking operations.

When I left school, I never wondered whether my apartment in New York was vulnerable to storm surges, but my three daughters have to consider the realities of extreme weather and how it may destabilize communities around the globe.

The U.S. has a proud history of cleaning up our air through technological innovation. We did it with leaded gas, acid rain and countless other pollutants, and we can do it with carbon pollution, too.

The U.S. limits mercury, arsenic, and soot from power plants. Yet, astonishingly, there are no national limits on how much carbon pollution these plants can dump into our atmosphere.

Americans welcome carbon limits because they want to protect their families from harm.

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.

Back when the EPA proposed phasing out ozone-depleting CFCs, the chemical industry howled that refrigerators would fail in America's supermarkets, hospitals and schools.

NRDC has helped bring hope spots to more of our shared ocean waters. We helped draft and pass a California law creating a network of underwater parks stretching from the Oregon border to the Mexican border.

The San Gabriel Valley, stretching from Pasadena to Pomona, is especially starved for open space. The valley has a rich array of ethnically diverse communities, but it also has some of the highest rates of childhood obesity and diabetes in the state.

The San Gabriel monument expands our natural heritage, but there is more in need of safeguarding - extraordinary places like Utah's Greater Canyonlands.

Nearly every president in the past 100 years has declared national monuments, from Teddy Roosevelt creating the Grand Canyon National Monument to George W. Bush preserving 10 islands and 140,000 square miles of ocean waters in the Northwestern Hawaiian Islands.

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.

Los Angeles County is one of the most park-poor urban areas in the nation, and the San Gabriel Valley - stretching from Pasadena to Pomona - is especially starved for open space.

Los Angeles County is one of the most park-poor urban areas in the nation, and the San Gabriel Valley - stretching from Pasadena to Pomona - is especially starved for open space.

The U.S. can become carbon neutral in our lifetimes. In the process, we will put millions of Americans to work, make our companies more competitive, and shield our communities from extreme weather. And we will honor our obligation to leave the world a better place for future generations.

The U.S. can become carbon neutral in our lifetimes. In the process, we will put millions of Americans to work, make our companies more competitive, and shield our communities from extreme weather. And we will honor our obligation to leave the world a better place for future generations.

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.

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.