Colby College in Maine recently completed a study of chemical compounds called PFAS's , these are found in "fluro"-type ski waxes. On this episode of This Green Earth, Nell and Chris are joined by a lead author of this study, Gail Carson, who talks about this research, it's surprising findings and why changes in the use of this type of ski wax are being pursued. These "forever" chemicals can get into the snow, soil and surface water, causing biological harm to the local ecology.