Jessika Trancik usesing an app she and her students developed, which provides information on vehicles’ carbon footprint. Trancik is an energy-systems researcher who studies how electric batteries might affect fossil-fuel use. Her findings help policymakers, and have helped to guide the US delegation to the Paris climate negotiations. “It also helps those considering investing in carmakers, as well as engineers who are developing road networks,” she writes. (Nature | 3 min read) (Kayana Szymczak for Nature)
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