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.  To store hydrogen in liquid form, hydrogen must be cooled to -423 °F, requiring a tremendous amount of energy.

Hydrogen vehicle fueling stations may generate hydrogen on-site or receive deliveries of trucked-in hydrogen.

Hydrogen’s energy density is 52,000 Btu/lb., which is three times greater than that of gasoline.

Most Geothermal Resources Are Near Plate Boundaries The most active geothermal resources are usually found along major plate boundaries where earthquakes and volcanoes are concentrated. Most of the geothermal activity in the world occurs in an area called the Ring of Fire. This area encircles the Pacific Ocean.

The ring of fire goes around the edges of the Pacific. The map shows that volcanic activity occurs around the Pacific rim.Source: National Energy Education Development Project (Public Domain) Naturally occurring large areas of hydrothermal resources are called

U.S. Production 13.95 billion gallons 332.11 million barrels

U.S. Production 0.97 billion gallons 23.03 million barrels

eothermal power plants do not burn fuel to generate electricity, so their emission levels are very low. They release less than 1% of the carbon dioxide emissions of a fossil fuel plant. Geothermal plants use scrubber systems to clean the air of hydrogen sulfide that is naturally found in the steam and hot water.

Geothermal plants emit 97% less acid rain-causing sulfur compounds than are emitted by fossil fuel plants. After the steam and water from a geothermal reservoir have been used, they are injected back into the Earth.

In 2011, U.S. geothermal power plants produced about 17 billion kilowatt-hours (kWh), or 0.4% of total U.S. electricity generation.

They may also reduce the amount of electricity generated from fossil fuels and therefore reduce the amount of air pollution, carbon dioxide emissions, and water use of fossil fuel power plants.

Modern wind turbines are very large machines, and some people do not like their visual impact on the landscape. A few wind turbines have caught on fire, and some have leaked lubricating fluids, though this is relatively rare. Some people do not like the sound that wind turbine blades make. Some types of wind turbines and wind projects cause bird and bat deaths. These deaths may contribute to declines in species that are also being affected by other human-related impacts. Many birds are killed from collisions with vehicles and buildings, by house cats and hunters, and by pesticides. Their natural habitats may be altered or destroyed by human development and by the changes in the climate that most scientists believe are caused by greenhouse gases emissions from human activities (which wind energy use can help reduce).

Making the metals and other materials in wind turbines and the concrete for their foundations requires the use of energy, which may be from fossil fuels.

3,816,000 Gigawatts of Electricity is used in the United states each year

William Grove, a chemist, physicist and lawyer, is generally credited with inventing the fuel cell in 1839

n the late 1950s and early 1960s NASA, in collaboration with industrial partners, began developing fuel cell generators for manned space missions.

The construction phase involves the construction of the geothermal field(s), infrastructure, power plants, and transmission lines.