Environmental Science

Plants produce energy so perfectly: converting sunlight, carbon dioxide and water into power and emitting nothing harmful in the process. Can we imitate such an elegant system?

By Julia Layton & Yara Simón

Solar energy is clean and plentiful. There's one big problem, though: The sun doesn't shine all the time. Is there a way to keep solar plants powered up through the night?

By Julia Layton

The oceans' levels change daily across the globe. We know them as tidal changes. But what causes this constant shift in sea level and why is it more dramatic is some places than others?

By Mark Mancini

Alternative energy usually means something is mined, refined, collected or grown. But gravity-powered floor lamps rely only on a force of nature -- and the strength of a human being.

By Julia Layton

Photovoltaic solar panels are like windows -- they build up a coating of grime that requires a good cleaning from time to time. What's the alternative to climbing the roof with a squeegee and bucket of suds?

By Maria Trimarchi

Gasification could represent a second chance for coal. Will this old technology, which can run on coal or biomass, get a new life as one of the most important energy alternatives of the future?

By William Harris

How much energy does your TV use when it's plugged in all night? How much power is your stereo system draining from the socket monthly? The Kill A Watt and other energy monitors help you find out.

By Julia Layton

Cellulosic ethanol can be made from any old stem, leaf or tree trunk. Farm wastes, grass clippings and recycled newspaper will work, too. So when can we expect this alternative fuel to arrive at gas stations?

By Susan L. Nasr

Geysers are beautiful and their eruptions are exciting, but these fragile natural wonders are not to be trifled with. The water shooting from the geyser -- and the eruptions themselves -- can cause serious damage.

By Jonathan Atteberry

For decades, we've depended on an outdated, centralized power system that wastes power and occasionally fails to meet everyone's needs. The idea of a localized power grid, or microgrid, might just be the change we need.

By Robert Lamb

The Sierra Club lobbies for environmental preservation and engages members in fun wilderness excursions.

By Sarah Dowdey

On a planet that is 70 percent water, people don't have enough clean, safe water to drink. We're in a water crisis, and water rights are becoming a big issue. What happens if we just plain run out?

By Josh Clark

The sea scorpion may have been the largest bug to ever live on the Earth, according to a recent find. Learn more about the giant sea scorpion.

By Josh Clark

It's evident the debate over climate change is a heated one. Are skeptics clouding the public judgment for money? Are climate-change believers merely alarmists who risk the present for the future?

By Josh Clark

Crews have to race to contain the damage from major oil spills to prevent damage to beaches, death to marine life and birds, and devastation to local wetlands. So how do they clean them up?

By Josh Clark & Sarah Gleim

Are dinosaurs real? Most people don't have to travel too far to answer that question in the affirmative with some kind of exhibit displaying dinosaur fossils. Or simply look at any bird you can see outside your home.

By Tracy V. Wilson

Hieroglyphics used to be a language that no one -- Egyptian or otherwise -- could decipher. With the help of the Rosetta Stone, that all changed.

By HowStuffWorks.com Contributors

Consumers are becoming more and more knowledgeable about food safety and their health. As a result, organic farming has entered the agriculture mainstream. But what methods must be used, and how is organic farming certified?

By Maria Trimarchi

Recycling is a pretty simple concept: take something that isn't useful anymore and make it into something new. Learn about the process and the good and bad of recycling.

By Ed Grabianowski

While actual footprints measure size, weight and speed, carbon footprints measure how much carbon dioxide (CO2) we produce in our daily lives. Do you know how big your carbon footprint is?

By Sarah Dowdey

Eco-conscious people purchase carbon offsets to help reduce worldwide greenhouse gas emissions. But do offsets actually help, and what does Pink Floyd have to do with them?

By Sarah Dowdey

In its purest form, it's odorless, nearly colorless and tasteless. It's in your body, the food you eat and the beverages you drink. All forms of life need it. What substance is more necessary to our existence than any other? Water.

By Shanna Freeman

You probably know that the North Pole does not stay in the same spot. The North and South Poles can actually change positions. What causes this? Find out in this article.

By Tracy V. Wilson

The Great Pacific Garbage Patch is the world's largest landfill, and it can be found in the middle of the Pacific. Millions of pounds of trash collect here.

By Jacob Silverman

How do we reduce greenhouse gas emissions? A carbon tax is one answer. A simpler alternative to cap-and-trade schemes, a carbon tax encourages energy efficiency and reduced consumption.

By Sarah Dowdey