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The main motivation to replace fossil fuels with renewable energy sources is to slow and eventually stop climate change, which is widely agreed to be caused mostly by greenhouse gas emissions. In general, renewable energy sources cause much lower emissions than fossil fuels. [ 12 ]
CNG vehicles can use both renewable CNG and non-renewable CNG. [60] Conventional CNG is a fossil fuel. New technologies such as horizontal drilling and hydraulic fracturing to economically access unconventional gas resources, appear to have increased the supply of natural gas in a fundamental way. [61]
Renewable natural gas can be produced and distributed via the existing gas grid, making it an attractive means of supplying existing premises with renewable heat and renewable gas energy. Renewable natural gas can also be converted into liquefied natural gas (LNG) or compressed natural gas (CNG) for direct use as fuel in transport sector.
Renewable fuels are fuels produced from renewable resources. Examples include: biofuels (e.g. Vegetable oil used as fuel, ethanol, methanol from clean energy and carbon dioxide [1] or biomass, and biodiesel), Hydrogen fuel (when produced with renewable processes), and fully synthetic fuel (also known as electrofuel) produced from ambient carbon dioxide and water.
From 2005 to 2007 a number of types of vegetable oil have doubled in price. The rise in vegetable oil prices is largely attributed to biofuel demand. [19] Much of the fuel price at the pump is due to fuel tax. If you buy vegetable oil at the grocery store it does not have such high taxes.
Traditionally, the United States's energy sources have included oil, coal, nuclear, renewables and natural gas. The breakdown of each of these fuels as a percentage of the overall consumption in the year 1993, per EIA was: coal at 53%, nuclear energy at 19%, natural gas at 13%, renewable energy at 11% and oil at 4% of the overall energy needs.
This measurement difference can lead to underestimating the economic contribution of renewable energy. [13] Enerdata displays data for "Total energy / production: Coal, Oil, Gas, Biomass, Heat and Electricity" and for "Renewables / % in electricity production: Renewables, non-renewables". [4]
[123] [124] Although the uranium ore used to fuel nuclear fission plants is a non-renewable resource, enough exists to provide a supply for hundreds to thousands of years. [ 125 ] [ 126 ] However, uranium resources that can be accessed in an economically feasible manner, at the present state, are limited and uranium production could hardly keep ...