Some people prefer to be self-employed, whereas others like working for companies or institutions. Discuss the advantage and disadvantages of both approaches. which do you think is a better approach?

The line chart provides information from 2008 research about the usage of six different energy in America during the period from 1980 to 2030. Generally speaking, most of the categories increased over the period

while

one item remained at a similar number.

Moreover

, it is obvious that petrol and oil were used the most between 1980 to 2030.

To begin

with, 35

quadrillion

units

of petrol and oil were used in 1980 and

then

dropped slightly to approximately 34

quadrillion

units

in 1995.

However

, the consumption of petrol and oil was predicted to rise dramatically to nearly 50

quadrillion

units

in 2030.

Furthermore

, in terms of coal and natural gas, there was a fluctuation between these two categories.

Although

the consumption of coal and natural gas separately stood at approximately 16

quadrillion

units

and 20

quadrillion

units

, they were projected to increase considerably to approximately 29

quadrillion

units

and roughly 25

quadrillion

units

, respectively.

With regard

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nuclear, solar and wind and hydropower, these three categories grew steadily before 2008.

Nevertheless

, they were predicted to keep stable for the rest of the period.