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What human activities increase carbon dioxide in the atmosphere?

science.howstuffworks.com/environmental/green-science/human-activities-increase-carbon-dioxide.htm

Although a certain amount of carbon dioxide (CO2) occurs naturally in the Earth's atmosphere, there are several human activities that increase levels of the greenhouse gas.

The Sahara Desert Is Getting Bigger

science.howstuffworks.com/environmental/earth/geology/sahara-desert-is-getting-bigger.htm

Deserts around the world are slowly expanding. HowStuffWorks checks out the science behind these increases in size.

Ridiculous History: The Curse of the Colonel

history.howstuffworks.com/american-history/ridiculous-history-curse-colonel.htm

Colonel Sanders has been the bane of one baseball team for more than 30 years, and it has nothing to do with chicken. Learn more at HowStuffWorks Now.

Let's Go to the 1893 World's Fair, Without a Time Machine

history.howstuffworks.com/historical-events/virtual-reality-1893-worlds-fair.htm

You can visit the 1893 World's Fair, with some help from virtual reality. Learn about how virtual reality is changing history at HowStuffWorks Now.

As Light Pollution Grows, Much of Humanity Can't See the Milky Way

science.howstuffworks.com/environmental/green-science/light-pollution-night-sky-worsening.htm

A new 'atlas' of light pollution finds that one third of people on Earth can't see the night sky's most dramatic feature.

Remembering Some of the Craziest Custom RVs

auto.howstuffworks.com/remembering-some-craziest-custom-rvs.htm

Learn about some of history's craziest custom RVs, compliments of the guys at CarStuff.

The World's Largest Waterfall Is Deep Underwater

science.howstuffworks.com/environmental/earth/oceanography/worlds-largest-waterfall-underwater-denmark-strait-cataract.htm

The Denmark Strait cataract dwarfs every other waterfall in the world, but you can't see it because it's deep under the Atlantic Ocean.

Nutria: River Rats Only a Mother Could Love

animals.howstuffworks.com/mammals/nutria-river-rats-only-mother-could-love.htm

Nutria have their place in the world, but they can be very destructive. HowStuffWorks looks at these rodents.

Why Is an Asteroid Worth $10,000,000,000,000,000,000?

science.howstuffworks.com/psyche-16-asteroid.htm

A distant asteroid made mostly of iron is potentially worth $10,000 quadrillion, making it many times more valuable than the global economy.

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