From his office in the Berkeley hills, Art Rosenfeld looks out on the heart of California’s Bay Area. The 87-year-old scientist keeps a pencil and a small notebook in his breast pocket, ready to jot down a quick note or make a calculation. With these simple tools he has been able to influence state and national energy policy over the years. But for now they stay tucked away as he enjoys the scenery. “I get a pretty good view of San Francisco,” Rosenfeld says.
While his vantage point has remained unchanged since beginning his career at Lawrence Berkeley National Laboratory in 1955, the view outside his window has changed considerably. The buildings are taller and more densely packed in on all sides of the bay. And from Rosenfeld’s bird’s-eye view, he sees that many of these buildings now boast noticeably brighter rooftops than they did even a few years ago.
This brightening is a direct result of Rosenfeld’s vision. For decades he has promoted “cool” roofs, which are lighter in color than traditional black slabs and therefore reflect more of the sun’s heat. Cool roofs save money by keeping i... Read more