The pie charts illustrate the changes in energy production from five different sources (oil, natural gas, hydroelectric power and nuclear power) for the USA in two different years (1980 and 1990).
Overall, oil constituted the main source of energy production in both years, while hydroelectric power produced the least energy. There was a single decrease in production from oil and natural gas, whereas an increase can be seen in the figure for coal and nuclear power.
The amount of energy produced by oil in the USA was 42% in 1980 and this, then declined to a third (33%) in 1990. The proportion of energy from hydroelectric power, on the other hand remained constant in both years at a mere 5%.
The energy generated by natural gas, which was the second largest source of energy in the USA in 1980, fell by 1% to a quarter of all energy produced in 1990. In contrast, production by coal rose from 22% to 27% in 1990. While there was a 5% increase in energy from nuclear power to reach 10% in the second year.
The pie charts illustrate the
changes
in
energy
production
from five
different
sources
(oil
, natural gas, hydroelectric
power
and nuclear
power)
for the USA in two
different
years (1980 and 1990).
Overall
,
oil
constituted the main source of
energy
production
in both years, while hydroelectric
power
produced the least
energy
. There was a single decrease in
production
from
oil
and natural gas, whereas an increase can be
seen
in the figure for coal and nuclear power.
The amount of
energy
produced by
oil
in the USA was 42% in 1980 and this, then declined to a third (33%) in 1990. The proportion of
energy
from hydroelectric
power
,
on the other hand
remained constant in both years at a mere 5%.
The
energy
generated by natural gas, which was the second largest source of
energy
in the USA in 1980, fell by 1% to a quarter of all
energy
produced in 1990.
In contrast
,
production
by coal rose from 22% to 27% in 1990.
While
there was a 5% increase in
energy
from nuclear
power
to reach 10% in the second
year
.