Environmentalist: Pollution from gasoline burned by cars contributes to serious environmental problems.
Statements
causal (X contributes to Y)
Pollution from gas burned by cars contributes to big environmental problems.
pivots (But, however)
The cost of these problems isn't reflected in prices of gas.
causal (X, hence Y / as a result)
The fact that problems aren't reflected in prices leads to lots of consumers not taking that into account when deciding how much to drive.
Heavier taxes on gas would reflect the cost and lead to consumers polluting less.
Evaluate
In normal life, if someone were to ask us, "What should we conclude from all this?", we would probably just say
But in LSAT life, who knows what angle they might take. It could be something boring but technically true like, .
Goal
Let's just look for the most provable answer, something safely-worded that can be supported by combining two or more claims.