A typical gasoline-powered lawn mower emits about as much air-polluting material per hour of use as does an automobile.
Conclusion
People can help reduce air pollution by choosing electric mowers over gasoline ones whenever feasible.
Evidence (since)
A typical gasoline-powered lawn mower emits about as much air-polluting material per hour of use as does an automobile.
Collectively, such mowers contribute significantly to summer air pollution.
Electric mowers emit no air pollutants.
Evaluate
This argument is presenting a Plan/Goal pattern.
Goal: Reduce air pollution.
Plan: Use electric mowers instead of gasoline-powered mowers whenever feasible.
To strengthen the Plan/Goal, we want to ensure that switching to electric mowers will indeed result in a significant reduction of air pollution. In addition, the argument primarily highlights that electric mowers emit no pollutants directly. To support the argument, we could emphasize that using electric mowers, including their indirect emissions, would still be less polluting than using gasoline mowers.
Goal
Let's find an answer that allows us to argue more persuasively that choosing electric mowers over gasoline mowers will reduce air pollution. Additionally, consider the overall environmental impact, including the generation of electricity needed for electric mowers.