Friday, November 29, 2013

Actions for Earth: Green Energy [Hem9.2 (2010)]

Today's generation is more aware of the urgent need to be environmentally friendly - in colloquial terms to ëgo greení. There has been an increasing use of renewable energy sources worldwide, like hydroelectricity, solar power and wind turbines. Green energy is energy that is produced in a clean and efficient manner that has less of a negative impact to the environment than energy resources like fossil fuels. One of the goals of green energy is to reduce greenhouse gas emissions.

Sources for green energy are such as the Sun (solar energy), wind (wind power), rivers
(hydroelectric power), hot springs (geothermal energy), tides (tidal power), and biomass
(biofuels). There are several more, even including nuclear energy, that is sometimes considered a green energy source because of its lower waste output relative to energy sources such as coal or oil.

Fossil fuel combustion has a number of negative environmental consequences. Fossil-fuelled power plants emit air pollutants such as sulfur dioxide, particulate matter, nitrogen oxides, and toxic chemicals. Mobile sources, such as fossil-fuelled vehicles, emit nitrogen oxides, carbon monoxide, and particulate matter. Exposure to these pollutants can cause heart disease, asthma, and other human health problems. Furthermore, the burning of fossil fuels releases carbon dioxide (CO2), one of the main greenhouse gases that cause global warming.

At the beginning of the 21st century, about 80% of the worldís energy supply was derived from fossil fuels such as coal, petroleum, and natural gas. Fossil fuels are finite resources, meaning that one day it will run out. Green energy on the other hand is renewable and come from replenish-able sources.

In contrast to fossil fuels, renewable energy sources accounted for nearly 20% of global energy consumption at the beginning of the 21st century. About 15% of that energy comes from large hydroelectric power plants, whereas other types of renewable energy, such as solar, wind, and geothermal, account for 3.4% of total electricity generation.

The goal of green energy is generally to create power with as little pollution as possible. Many sources of green energy can come directly from the area in which the energy is needed rather than from an outside source. For example, you can use solar panels for the purpose of collecting energy and convert it in electricity for use in your residence.

It is not necessary for green energy sources to originate from places like solar or wind fields. A green energy source can also come from a building that is architecturally designed in a way to keep itself cool in the daytime and warm in the night. The conservation of energy through the building becomes a green energy source.


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