In this Feb. 15, 2019 photo, real estate agent Tom Saab stands on a oceanfront deck at a condo he developed in Salisbury, Mass. Academic researchers say concerns over rising sea levels and increased flooding are having subtle but significant impacts on coastal property values, finding that climate change concerns have sapped more than $15 billion in appreciation from homes along the Eastern Seaboard and Gulf Coast. (AP Photo/Elise Amendola)