Carrie Scarr (M.S.), Bozeman, Montana, is a writer, illustrator and YouTuber who published the book 136 Frugal Ways to Save the Planet, which offers small eco-friendly and cost-effective changes -- such as reducing meat consumption, making laundry detergent and thrift shopping -- to fight climate change, pollution and habitat destruction. She writes about frugal living on her blog, FrugalCarrie, and posts YouTube videos on @FrugalCarrie.