The major sources of alternative en

The major sources of alternative energy are biorenewables, hydro,
solar, wind, geothermal and other energies, each of them having
their own advantages and disadvantages, including political,
economical and practical issues. Renewable energy is a promising
alternative solution because it is clean and environmentally safe.
They also produce lower or negligible levels of greenhouse gases
and other pollutants when compared with the fossil energy
sources they replace [8].
There are some barriers to the development of biofuel production.
They are technological, economical, supply, storage, safety,
and policy barriers. Reducing these barriers is one of the driving
factors in the government’s involvement in biofuel and biofuel research
and development. Production costs are uncertain and vary
with the feedstock available.
The major non-technical barriers are restrictions or prior claims
on use of land (food, energy, amenity use, housing, commerce,
industry, leisure or designations as areas of natural beauty, specialscientific interest, etc.), as well as the environmental and ecological
effects of large areas of monoculture. For example, vegetable oils
are a renewable and potentially inexhaustible source of energy
with energy content close to diesel fuel. On the other hand, extensive
use of vegetable oils may cause other significant problems
such as starvation in developing countries. The vegetable oil fuels
were not acceptable because they were more expensive than
petroleum fuels.