La Niña's return and looming climate change put the tropical Pacific back in the spotlight.

As Uncle Sam scrambles to revitalize the economy, many are wondering: Is renewable doable?

Some say evolving bugs and lax oversight are making salmonella even more dangerous.

The U.S. and China are forming an uneasy alliance as the world warms and a U.N. climate conference looms.

With renewed momentum but no plans to store its waste, American nuclear energy sits in limbo.

Hybrid sales are down, but federal efficiency rules could fuel a comeback.

Cities are already more energy-efficient than rural areas, but they'll still need to improve as their populations swell.

Despite being phased out of many products, mercury still lurks in our homes.

There's a lot you can do to save water. Here's a brief rundown from your friends at the Mother Nature Network that includes methods for saving water with your s

The subtropical swamp fights for survival in an environmental quagmire.

It can be better for the climate than gasoline, but this colorless liquid isn't always as green as it seems.

As summer thunderstorms loom across the U.S., MNN sheds some light on lightning -- one of the deadliest and least-understood weather events on Earth.

Long-running water shortages have plagued the U.S. from California to Carolina in recent years.

Coal is a cornerstone of modern life, but its foundations pre-date the dinosaurs.

The Atlantic hurricane season woke up early in 2009, fired off a weak tropical depression that didn't threaten land, and then hit snooze for two months.

Most Americans live in urban areas, forming huge hot spots of energy consumption. But while rural residents use less energy overall, cities are often slicker ab

Fish are one of the healthiest foods on Earth, but many are brimming with toxic mercury.

As the U.S. considers new offshore drilling operations, a major motivator is reducing its reliance on foreign oil. Here's a look at where U.S. oil imports come

As oil pours into the Gulf of Mexico and a potentially wild hurricane season looms, many Americans are worried that gas prices might go into overdrive.

Hurricanes are more than just thunderstorms on steroids, here's how hurricanes form, and what you can do to be ready for one.

The U.S. endangered species list isn't all gloom and doom: Just ask a bald eagle. Nonetheless, 93 species have joined the list for every one it's saved.

U.S. organic farming has grown wildly in the last two decades, but with food demand rising and many cash-strapped shoppers pinching pennies, are greener acres s

A process known as "coral bleaching" has triggered near-record rates of death and dormancy in coral reefs. At least 19 percent of Earth's coral reefs are dead.

As snow bombards the U.S. this winter, MNN takes a look at how Mother Nature produces something so delicate and so dangerous.

Salt saves lives on icy roads, but it can have the opposite effect in nearby ecosystems. Here's a look at the pros and cons of it and other de-icers.

The U.S. has more tornadoes than anywhere else on Earth, but their sudden twists and turns still make them mysterious and mesmerizing.

As Japan recovers from a massive earthquake, here's a look at why such tremors happen and where the next one might strike.

The U.S. has had several wild years of wildfires, and scientists say climate change is likely fanning the flames.

Floods are the most common natural disaster in the United States. Here's a closer look at how they occur and how to stay safe.

It's just a tiny, mindless bundle of genes, but the flu has the power to hijack our bodies, turn us against each other and even cripple human civilization.

Water quality in the U.S. is better than it used to be, but plenty of old and new dangers still lurk beneath the surface.

Fireworks can unleash a shower of toxins into soil and water, and scientists are only beginning to figure out what that means for human health.

With more than 160 active volcanoes, the United States is at greater risk from eruptions than many people realize.

From ball lightning and blue jets to elves and sprites, thunderstorms have a lot of tricks up their sleeves.

A huge sea of plastic trash is swirling in the North Pacific — part of an even broader plastic plague that's growing in oceans worldwide.

From red tides in the Atlantic to hypoxia in the Gulf, algae seems to be invading the U.S. from all sides.

A fungus is obliterating North America's bats in 'one of the most severe wildlife diseases ever recorded,' scientists warn.

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