CAMBRIDGE, MA –- Last week, in a new initiative to combat climate change, health-food magnate and Clover CEO Jeff Henderson substituted the company’s entire supply of single-use napkins with one handkerchief. “Do you know the number of trees we’re saving?” Henderson poses. “Seriously, how many? I haven’t done the math yet – but I’m sure it’s a lot.” Clover’s “science guy” assured us that it is indeed a lot.