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Wind turbine installations impact vast amounts of land, far more than traditional power plants.

Wind turbine installations require vast amounts of steel, copper, rare earth metals, fiberglass, concrete, rebar and other materials for the turbines, towers and bases.

Principal health issues are associated with noise – not just annoying audible noise, but inaudible, low-frequency “infrasound” that causes headache, dizziness, “deep nervous fatigue” and symptoms akin to seasickness. “Wind turbine syndrome” also includes irritability, depression, and concentration and sleep problems. Others include “shadow flicker” or “strobe effect” from whirling blades, which can trigger seizures in epileptics, “vibroacoustic” effects on the heart and lungs, and non-lethal harm to animals. Serious lung, heart, cancer and other problems have been documented from rare earth mining, smelting and manufacturing in China, under its less rigorous health, workplace and environmental regulations.

Wind farms can cause climate change, according to new research, that shows for the first time the new technology is already pushing up temperatures.

Usually at night the air closer to the ground becomes colder when the sun goes down and the earth cools. But on huge wind farms the motion of the turbines mixes the air higher in the atmosphere that is warmer, pushing up the overall temperature.

Thirty-eight nationally recognized companies in the United States, including eleven Fortune 500 corporations, are collectively saving millions of dollars in electricity costs while reducing carbon emissions by tens of thousands of tons per year by using fuel cells, according to a new report by Fuel Cells 2000, a non-profit education and outreach organization. 

Tidal power, also called tidal energy, is a form of hydropower that converts the energy of tides into useful forms of power - mainly electricity.

“headaches, ear pain, nausea, blurred vision, anxiety, memory loss,

When a visible light photon strikes a solar cell it can do one of three things: pass straight through, be reflected, or be absorbed. If the photon is absorbed, its energy is absorbed by an electron in an atom of the solar cell enabling it to escape from its normal position (photon excitation), cross the junction and fill a hole. Since electrons are physically moving across the PN junction, the positive charge carrying holes are effectively moving in the opposite direction around the load circuit (a rechargeable battery or light bulb etc). This completes the circuit providing more holes for the electrons to combine with and providing usable electricity.

As of October 2009, Fortune magazine estimated the cost of producing the Honda Clarity at $300,000 per car

by 2010, the Department of Energy estimated that the cost had fallen 80% and that such fuel cells could be manufactured for $51/kW,

When compared to ICE vehicles using gasoline, however, fuel cell vehicles using hydrogen produced from natural gas reduce greenhouse gas emissions by 60%

Ocean waves are caused by the wind as it blows across the sea. Waves are a powerful source of energy.

How it works There are several methods of getting energy from waves. One of them works like a swimming pool wave machine in reverse. At a swimming pool, air is blown in and out of a chamber beside the pool, which makes the water outside bob up and down, causing waves.   At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator.

Once you've built a wave power station, the energy is free, needs no fuel and produces no waste or pollution.

Biomass is organic material made from plants and animals (microorganisms). Biomass contains stored energy from the sun. Plants absorb the sun's energy in a process called photosynthesis. The chemical energy in plants gets passed on to animals and people that eat them. Biomass is a renewable energy source because we can always grow more trees and crops, and waste will always exist. Some examples of biomass fuels are wood, crops, manure, and some garbage. When burned, the chemical energy in biomass is released as heat. If you have a fireplace, the wood you burn in it is a biomass fuel. Wood waste or garbage can be burned to produce steam for making electricity, or to provide heat to industries and homes.

Crops like corn and sugar cane can be fermented to produce ethanol. Biodiesel, another transportation fuel, can be produced from left-over food products like vegetable oils and animal fats.

Ethanol and biodiesel were the fuels used in the first automobile and diesel engines, but lower cost gasoline and diesel fuel made from crude oil became the dominant vehicle fuels. The Federal government has promoted ethanol use in vehicles to help reduce oil imports since the mid-1970s.

First generation biofuel are those fuel derived from vegetable or animal fats/oils, starch or sugar with the use of modern technology.

Unless soybean oil prices decline dramatically, it does not appear that biodiesel can be produced in large quantities at a cost that is competitive with petroleum diesel