Energy Facts
Resources

Fossil fuel
Remaining reserves of conventional fossil fuels are estimated as:

Fuel                Energy reserves in ZJ
Coal                                        290.0
Oil                                          18.4
Gas                                        15.7

Significant uncertainty exists for these numbers. The estimation of
the remaining fossil fuels on the planet depends on a detailed
understanding of the Earth crust. This understanding is still less
than perfect. While modern drilling technology makes it possible
to drill wells in up to 3 km of water to verify the exact composition
of the geology, one half of the ocean is deeper than 3 km, leaving
about a third of the planet beyond the reach of detailed analysis.
At the same time, long before fossil fuels run out, the effect of
continuing to use them at current rates would cause havoc to the
climate through global warming.[33] These figures may be too
optimistic. Energy Watch Group reports show that we already
cannot supply the demand for oil[34] and that uranium resources
will be exhausted within 70 years. [35]

Coal

Coal is the most abundant fossil fuel. According to the
International Energy Agency the proven reserves of coal are
around 909 billion tonnes, which could sustain at the current
production rate for 155 years.[36] This was the fuel that launched
the industrial revolution and has continued to grow in use; China,
which already has many of the world's most polluted cities,[37] was
in 2007 building about two coal fired power plants every
week.[38][39] Coal is the fastest growing fossil fuel and its large
reserves would make it a popular candidate to meet the energy
demand of the global community, short of global warming
concerns and other pollutants.[40] With the Fischer-Tropsch
process it is possible to make liquid fuels such as diesel and jet
fuel from coal. The Stop Coal campaign calls for a moratorium on
the construction of any new coal plants and on the phase out of all
existing plants, citing concern for global warming.[41] In the
United States, 49% of electricity generation comes from burning
coal.[42]

Oil

It is estimated that there may be 57 ZJ of oil reserves on Earth
(although estimates vary from a low of 8 ZJ,[1] consisting of
currently proven and recoverable reserves, to a maximum of 110
ZJ consisting of available, but not necessarily recoverable
reserves, and including optimistic estimates for unconventional
sources such as tar sands and oil shale. Current consensus
among the 18 recognized estimates of supply profiles is that the
peak of extraction will occur in 2020 at the rate of 93-million
barrels per day (mbd). Current oil consumption is at the rate of
0.18 ZJ per year (31.1 billion barrels) or 85-mbd.
There is growing consensus that peak oil production may be
reached in the near future, resulting in severe oil price
increases.[43] A 2005 French Economics, Industry and Finance
Ministry report suggested a worst-case scenario that could occur
as early as 2013.[44] There are also theories that peak of the
global oil production may occur in as little as 2-3 years. The ASPO
predicts peak year to be in 2010. Some other theories present the
view that it has already taken place in 2005. World oil production
decreased from 84.63 mbd in 2005 to 84.60 mbd in 2006 but
increased in 2007 to 84.66 mbd, and is projected to increase to
87.70 mbd in 2009. One definition of peak is the inability to meet
demand, which has already occurred.[45][46]

Sustainability

Political considerations over the security of supplies,
environmental concerns related to global warming and
sustainability will move the world's energy consumption away from
fossil fuels. The concept of peak oil shows that we have used
about half of the available petroleum resources, and predicts a
decrease of production.
A government led move away from fossil fuels would most likely
create economic pressure through carbon emissions trading and
green taxation. Some countries are taking action as a result of the
Kyoto Protocol, and further steps in this direction are proposed.
For example, the European Commission has proposed that the
energy policy of the European Union should set a binding target of
increasing the level of renewable energy in the EU's overall mix
from less than 7% today to 20% by 2020.[47]
The Easter Island Effect is cited as an example of a culture that
was unable to develop sustainability and depleted nearly 100% of
its natural resources.[48]

Nuclear power

Nuclear fission

The International Atomic Energy Agency estimates the remaining
uranium resources to be equal to 2500 ZJ.[49] This assumes the
use of Breeder reactors which are able to create more fissile
material than they consume. IPCC estimated uranium deposits for
once-through fuel cycles reactors to be only 17 ZJ but then they
go on to say that exploration for uranium is still at its infancy.[50]
Resources and technology do not constrain the capacity of
nuclear power to contribute to meeting the energy demand.
However, political and environmental concerns about nuclear
safety and radioactive waste started to limit the growth of this
energy supply at the end of last century, particularly due to a
number of nuclear accidents. Concerns about nuclear
proliferation mean that the development of nuclear power by
countries such as Iran is being actively discouraged by the
international community.

Nuclear fusion

Fusion power is the process driving our sun and other stars. It
generates large quantities of heat by fusing the nuclei of
hydrogen isotopes. The heat can theoretically be harnessed to
generate electricity. The temperatures and pressures needed to
sustain fusion make it a very difficult process to control and doing
so is an unsolved technical challenge. The tantalizing potential of
fusion is its theoretical ability to supply vast quantities of energy,
with relatively little pollution.[51] Both the United States and the
European Union are supporting a moderate level of fusion-based
research, along with other countries.

Renewable resources

Renewable resources are available each year, unlike
non-renewable resources which are eventually depleted. A simple
comparison is a coal mine and a forest. While the forest could be
depleted, if it is managed properly it represents a continuous
supply of energy, vs the coal mine which once it has been
exhausted is gone. Most of earth's available energy resources are
renewable resources. Renewable resources account for more
than 93 percent of total U.S. energy reserves. Annual renewable
resources were multiplied times thirty years for comparison with
non-renewable resources. In other words, if all non-renewable
resources were uniformly exhausted in 30 years, they would only
account for 7 percent of available resources each year, if all
available renewable resources were developed.[52]

Solar energy

Renewable energy sources are even larger than the traditional
fossil fuels and in theory can easily supply the world's energy
needs. 89 PW[9] of solar power fall on the planet's surface. While it
is not possible to capture all, or even most, of this energy,
capturing less than 0.02% would be enough to meet the current
energy needs. Barriers to further solar generation include the
high price of silicon used to make solar cells, reliance on weather
patterns to generate electricity and a lack of space for solar cells
in areas of high demand, such as cities. Also, solar generation
does not produce electricity at night, which is a particular problem
in high northern and southern latitude countries; energy demand
is highest in winter, while availability of solar energy is lowest.
Globally, solar generation is the fastest growing source of energy,
seeing an annual average growth of 35% over the past few years.
Japan, Europe, China, U.S. and India are the major growing
investors in solar energy. Advances in technology and economies
of scale, along with demand for solutions to global warming, have
led photovoltaics to become the most likely candidate to replace
nuclear and fossil fuels.[53]

Wind power

The available wind energy estimates range from 300 TW to 370
TW.[9] Using the lower estimate, just 5% of the available wind
energy would supply the current worldwide energy needs. Most of
this wind energy is available over the open ocean. The oceans
cover 71% of the planet and wind tends to blow stronger over
open water because there are fewer obstructions.

Wave and tidal power

At the end of 2005, 0.3 GW of electricity was produced by tidal
power. [3] Due to the tidal forces created by the Moon (68%) and
the Sun (32%), and the Earth's relative rotation with respect to
Moon and Sun, there are fluctuating tides. These tidal fluctuations
result in dissipation at an average rate of about 3.7 TW. [54] As a
result, the rotational speed of the Earth decreases, and the
distance of the Moon to the Earth increases, on geological time
scales. In several billion years, the Earth will rotate at the same
speed as the Moon is revolving around it. So, several TW of tidal
energy can be produced without having a significant effect on
celestial mechanics.
Another physical limitation is the energy available in the tidal
fluctuations of the oceans, which is about 0.6 EJ (exajoule). [55]
Note this is only a tiny fraction of the total rotational energy of the
Earth. Without forcing, this energy would be dissipated (at a
dissipation rate of 3.7 TW) in about four semi-diurnal tide periods.
So, dissipation plays a significant role in the tidal dynamics of the
oceans. Therefore, this limits the available tidal energy to around
0.8 TW (20% of the dissipation rate) in order not to disturb the tidal
dynamics too much.[citation needed]
Waves are derived from wind, which is in turn derived from solar
energy, and at each conversion there is a drop of about two
orders of magnitude in available energy. The energy fluxes of
waves that wash against our shores add up to 3 TW. [56]

Geothermal

Estimates of exploitable worldwide geothermal energy resources
vary considerably. According to a 1999 study, it was thought that
this might amount to between 65 and 138 GW of electrical
generation capacity 'using enhanced technology'.[57]
A 2006 report by MIT that took into account the use of Enhanced
Geothermal Systems (EGS) concluded that it would be affordable
to generate 100 GWe (gigawatts of electricity) or more by 2050, just
in the United States, for a maximum investment of 1 billion US
dollars in research and development over 15 years.[29]
The MIT report calculated the world's total EGS resources to be
over 13 YJ, of which over 200 ZJ would be extractable, with the
potential to increase this to over 2 YJ with technology
improvements - sufficient to provide all the world's energy needs
for several millennia.[29]

Biomass

Production of biomass and biofuels are growing industries as
interest in sustainable fuel sources is growing. Utilizing waste
products avoids a food vs fuel trade-off, and burning methane gas
reduces greenhouse gas emissions, because even though it
releases carbon dioxide, carbon dioxide is 23 times less of a
greenhouse gas than is methane. Biofuels represent a
suststainable substitute for fossil fuels, but their net impact on
greenhouse gas emissions depends on the agricultural practices
used to grow the plants used as feedstock to create the fuels.
While it is widely believed that biofuels can be carbon-neutral,
there is evidence that biofuels produced by current farming
methods are substantial net carbon emitters.[58][59][60]

Hydropower

Hydroelectric power now supplies about 715,000 MWe or 19% of
world electricity (16% in 2003).[citation needed] Large dams are
still being designed. Nevertheless, hydroelectric power is
probably not a major option for the future of energy production in
the developed nations because most major sites within these
nations are either already being exploited or are unavailable for
other reasons, such as environmental considerations

Source: Wikipedia, the free encyclopedia
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