What is GJ and EJ stand for?
calculate the global energy requirement per person per year.
The world facing a challenge of climate change due to over reliance on fossil fuels that has to change if we serious about winning against global warming.
How much energy big industries consumes on average?
Why is it important to reduce energy consumption?
With a global population of 6.5 billion, each person's ‘drain’ on primary energy is, on average, around 73 GJ per year. But globally, there are major regional differences in energy consumption. Developed countries, with industrial as well as domestic demands, use energy in vast quantities and at alarming rates.
In North America it is around 350 GJ per person per year, nearly five times the global average, and totalling around 28% of global energy use by about 4.5% of world population. People in Europe and the former Soviet Union use about double the global average. The diagram, which shows the amount of lighting seen from space at night, gives a graphic picture of the inequalities of energy use.
In 2002, UK primary energy used was the equivalent of 9.7 EJ: about 164 GJ for each of the 59 million people in the UK, just over double the global average. About one-fifth of the UK's primary energy requirement is used in the home, 30% lost in conversion and most of the rest for services, transport and industry.
Global annual consumption of all forms of primary energy increased more than tenfold during the 20th century, and by the year 2002 reached an estimated 451 EJ. About three-quarters of this energy came from coal, oil and gas. If the global annual energy consumption is 451 EJ, then the average rate of consumption each second of every day (i.e. the global power demand) is:
For a global population at this time of 6.2 billion, how much primary power was needed to support the activities of each person in the world, on average?
Dividing 14.3 TW (14.3 × 1012 W) by the world population of 6.2 × 109 gives an average primary power requirement of 2.3 kW per person.
The average global figure of 2.3 kW per person is about five times less than that needed to enable each North American citizen to sustain the lifestyle to which he or she has grown accustomed.
If every individual in the world were to demand as much energy as the average person uses in North America, the global energy supply industries would require a fivefold increase in their use of primary energy sources. Even more daunting is the prospect of continued growth of both world population and per capita energy demand.