In this episode, HPAC 'On the Air' welcomes back environmental engineer Larry Clark, author of our popular Clark's Remarks sustainability column, which this summer is celebrating its 10th anniversary with HPAC Engineering. Based in South Florida, Larry is a small business owner, a longtime member of ASHRAE, and a member of our Editorial Advisory Board. He was also our first guest on this podcast more than two years ago. Here, Larry reflects on both his column and the growth of the sustainability movement over the last tumultuous decade.