In a simple word, renewable energy comes from natural cycles and systems, turning the ever-present energy around us into functional forms. Renewable (alternative) energy is mostly cleaner than energy from nonrenewable options such as natural gas, petroleum, and coal. But right now in the U. S. over many of these of our energy still comes from nonrenewable resources.
Such as the name says, green energy can be refilled continuously. Its sources include radiant energy like sun, thermal energy like geothermal, chemical processes like biomass, gravitational energy like hydropower, and motion energy like wind.
A few of the key sources of power include:
Solar electricity is able to one day solve much of the energy needs, but that day is still very remote. Still, solar technology has become more efficient and cost-effective every year, and it is the fastest-growing kind of renewable energy.
Wind power is one of the greenest technologies, and also one of the most abounding and cost-competitive energy resources, rendering it a viable option to the non-renewable powers that harm our health and threaten the environment. Yet wind power is unreliable as a frequent source of electricity, impacts great tracts of land, and it is unavailable where wind is intermittent.
Harnessing the kinetic power of moving normal water to generate electricity is the major source of renewable power in the USA and worldwide. Hydropower can be a sustainable and nonpolluting power source that can help decrease our dependence on fossil fuels and minimize the threat of global warming, but is limited to areas with large and regular drinking water supplies.
Ethanol is the product of crops full of sugar or starch, while biodiesel is the product of crops with high essential oil content. Both are natural carbon fuel, and both provide practical powers which may have not yet reached their full probable. Scientists continue refining food stocks to obtain higher efficiencies.
Heat from the earth, or geothermal energy, is cost effective, reliable, and clean, but is mostly limited to areas near tectonic plate limits. Some progress has recently been made recently in broadening the range of geothermal resources, but geothermal electric power remains a limited solution to our energy needs.
Another form of kinetic power technology, the ocean’s frequent motion by way of dunes, tides, and currents is an effective and clean energy resource. Like other hydro power, though, its geographic range is limited.
Renewable Energy and Environment/Climate Change –
There is general arrangement among the world’s major economies that it is essential to reduce carbon dioxide emissions by 50% by 2050. And with energy-related Carbon Dioxide accounting for 61 percent of global greenhouse gas emissions today, the energy sector must be at the heart of change.
Europe is committed to a 30 percent reduction by the year 2020 and a 60 to 80 percent decline by 2050, under stipulation that additional developing nations also obligate. To accomplish the things, it will require a huge sum of USD 22 trillion in global energy investments over the next 25 to 30 years.