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The line graph shows growth in the consumption of renewable energy during the period 1949-2008 in the USA

The line graph shows growth in the consumption of renewable energy during the period 1949-2008 in the USA B1Rw

The line graph shows growth in the consumption of renewable energy during the period 1949-2008 in the USA. The results are also broken down by source. The first thing to note is that renewable energy use more than doubled over the period, with particularly strong growth in biofuels. This sector did not exist in 1980 but experienced a steep rise during the 2000s to over one quadrillion Btu per year. This made biofuels a serious challenger to both wood and hydroelectric power, which both saw only limited growth overall. The former grew steadily between 1975 and 1985, but then slipped back to around its original level of 1. 8 quadrillion Btu. The latter began the period at the same level as wood but experienced more substantial growth. However, it also fell back to around 2 quadrillion Btu, with a particularly sharp drop in the late 1990s. Finally, wind power emerged late in the period but showed a gradual rise to around 0. 5 quadrillion Btu, suggesting that it, along with biofuels, will replace wood and hydroelectricity as the main sources of renewable every in the future.

The line graph This phrase/word (depending on the context) can be potentially replaced with :demonstratesportraysindicatesdisplays
shows
You use this word too often, consider replacing it withprosperitysuccessadvancehikeriseadvancement
growth
 in the consumption of renewable energy during the You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
 1949-2008 in the USA. The results are also
 broken down by source.

Three successive sentences begin with the same word. Consider rewording the sentence or use a thesaurus to find a synonym.
The
first
 thing to note is that renewable energy This phrase/word (depending on the context) can be potentially replaced with :exploit
use
 more than doubled over the You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
, with particularly
 strong You use this word too often, consider replacing it withprosperitysuccessadvancehikeriseadvancement
growth
 in biofuels. This sector did not exist in 1980 This phrase/word is too simple and can be replaced with:on the contrary
but
 experienced a steep rise during the 2000s to over one quadrillion Btu per year. This made biofuels a serious challenger to both wood and hydroelectric power, which both This phrase/word (depending on the context) can be potentially replaced with :witnessed
saw
This phrase/word (depending on the context) can be potentially replaced with :exclusively
only
 limited You use this word too often, consider replacing it withprosperitysuccessadvancehikeriseadvancement
growth
overall
. The former grew steadily
 between 1975 and 1985, This phrase/word is too simple and can be replaced with:on the contrary
but
 then slipped back to around its original level of 1. 8 quadrillion Btu. The latter began the You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
 at the same level as wood This phrase/word is too simple and can be replaced with:on the contrary
but
 experienced more substantial You use this word too often, consider replacing it withprosperitysuccessadvancehikeriseadvancement
growth
. However
, it also
 fell back to around 2 quadrillion Btu, with a particularly
 sharp drop in the late 1990s.

Finally
,Possible typo: you repeated a whitespace 
wind power emerged late in the You use this word too often, consider replacing it withtermspanstretchseasonagecourse
period
This phrase/word is too simple and can be replaced with:on the contrary
but
This phrase/word (depending on the context) can be potentially replaced with :demonstratedportrayedindicateddisplayed
showed
 a gradual rise to around 0. 5 quadrillion Btu, suggesting that it, along with biofuels, will replace wood and hydroelectricity as the main sources of renewable every in the future. 