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What do hydrogen fuel cell cars release?

“Hydrogen fuel cell vehicles combine hydrogen with oxygen to make electricity, and their only tailpipe emission is water.”

Reference: US Department of Energy

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What saturation of sulfur dioxide will cause people to cough

Sulfur dioxide is a colorless gas with a suffocating, choking odor. It is toxic to humans and concentrations as low as 8 ppm will produce coughing. Incredibly, in the Odyssey, Homer describes the burning of sulfur (formation of SO2) as a way that homes were 'fumigated'.

What is the most abundant element in the universe?

Hydrogen is the most abundant element in the universe, making up about 75% of all normal matter by mass.

Energy consumption in the U.S.

According to the U.S. Energy Information Administration, electricity consumption will increase by 51 percent from 2002 to 2025.

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