The entrepreneurial spirit

• A Japanese clothing manufacturer, Kochou fuku, announced in August a line of air-conditioned shirts, with two tiny battery operated fans inside to evaporate perspiration (for the equivalent of about $95). One drawback: The shirt billows out, suggesting that the wearer is overweight. • Among the recent recipients of Marin County (Calif.) Green Business certificates of environmental awareness was Pleasures of the Heart, a sex-toy and lingerie store that sells, among other items, rechargeable vibrators and erotic undergarments made of organic bamboo fabric.