They all have lower carbon emissions, compared to conventional energy sources. Alternative energy sources are renewable and are thought to be "free" energy sources. Alternative energy refers to energy sources that have no undesired consequences such for example fossil fuels or nuclear energy. Climate change, population growth, and fossil fuel depletion mean that renewables will need to play a bigger role in the future than they do today. It is expected that by 2050, one-third of the world's energy will need to come from solar, wind, and other renewable resources. One answer to global warming is to replace and retrofit current technologies with alternatives that have comparable or better performance, but do not emit carbon dioxide. This increased content of Carbon Dioxide increases the warmth of our planet and is the main cause of the so called “Global Warming Effect”. Every day, the world produces carbon dioxide by using of fossil fuels that is released to the earth’s atmosphere and which will still be there in next one hundred years time. The rest, 7% of the world’s energy needs, are supplied by alternative energy sources - more appropriately called renewables. Fossil fuel, along with nuclear energy a controversial, non-renewable energy source is supplying 93% of the world’s energy resources. There is no doubt that at our current rate of consumption, these fuels cannot occur fast enough to meet our current or future energy demands. The later fossil fuels which provide more substandard fuels like peat or lignite coal (soft coal) began forming as late as five million years ago in the Pliocene Period. This is when most of the major groups of animals first appeared on Earth. In fact, the earliest known fossil fuel deposits are from the Cambrian Period about 500 million years ago, way before the dinosaurs emerged onto the scene. Fossil fuels formed from plants and animals that lived hundreds of millions of years ago and became buried underneath the Earth’s surface where their remains collectively transformed into the combustible materials that we use for fuel. They are limited in supply and will one day they will be depleted. The fossil fuels are of non-renewable nature. Coal, oil and natural gas are the three kinds of fossil fuels that we have mostly depended on for our energy needs, from home heating and electricity to fuel for our industries, automobiles and mass transportation.
Alternative energy, simply means energy that is produced from sources other than our primary energy supply: fossil fuels.
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