chp4: reduce repetition of 'fossil fuel'

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@@ -81,22 +81,22 @@ even scientific researchers as the tobacco industry in their efforts to use
 science to defend their profits [@hulac-jul-2016]. They have also used the same
 strategies, including manufacturing scientific controversy, 'information
 laundering' through think-tanks, and providing financial support to scientists
-who promote views in line with their interests [@smoke-mirrors-hot-air]. Fossil
-fuel companies have used balancing norms in journalism to demand an equal public
+who promote views in line with their interests [@smoke-mirrors-hot-air]. Companies
+have used balancing norms in journalism to demand an equal public
 hearing for climate sceptics over their opponents, creating a public impression
 that the experts are divided on the reality of human-caused climate change or
 the urgency of the need to reduce greenhouse gas emissions [@leah-2011, pp.
-204-208]. Fossil fuel companies have obscured their involvement in their own
+204-208]. They have obscured their involvement in their own
 strategies by funneling their money through legal vehicles called 'donor
 foundations,' which give their money to think-tanks on their behalf while
 protecting their anonymity [@brulle-2014]. When climate sceptics don't leave a
-paper trail tracing their money back to the fossil fuel companies who benefit
+paper trail tracing their money back to those who benefit financially
 from the promotion of their views, they are much harder to refute, particularly
 in cultures like the UK and US which place a high value on the freedom of speech.
 
 Therefore, as long as the fossil fuel industry has significant power, the
 majority epistemology of our society cannot help but be partially shaped by
-fossil fuel interests. To escape fossil-think requires minority cognition.
+their interests. To escape fossil-think requires minority cognition.
 
 This has precedents even within the green movement. In the view of Linda Lear,
 the effect of _Silent Spring_, Rachel Carson's damning exposé on the chemical