"According to Francine Freederhouser, director of research at Plantonometrics, a manufacturer of computer chips, global warming will cost $3 trillion worldwide to reverse" is a weak use of a source because the source is

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The source is weak because it lacks a date, which is crucial for context in discussions about global warming, and because Francine Freederhouser is cited out of her field of expertise, as her background is in manufacturing computer chips, not climate science or economics.

"According to Francine Freederhouser, Director of Research at Plantonometrics, a Manufacturer