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which one would be more natural or better fit between the choices? Or both would go well with the context

1.Looking at the CO2 produced by each type of fuel, petroleum represents the biggest percentage with 42% as opposed to the natural gas which accounts for the lowest proportion/rate of 23%

2.Looking at the CO2 produced by each type of fuel, petroleum represents the biggest percentage with 42% as opposed to the natural gas which has the lowest proportion/rate of CO2 emissions, at 23%
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Anonymous1.Looking at the CO2 produced by each type of fuel, that from petroleum represents the biggest percentage with at 42% as opposed to the that produced by natural gas which accounts for the lowest proportion /rate of 23%.
Anonymous2.Looking at the CO2 produced by each type of fuel, petroleum represents the biggest percentage with of 42% comes from petroleum as opposed to the the 23% from natural gas which represents the lowest figure. has the lowest proportion/rate of CO2 emissions, at 23%