San Diego’s clean-technology business owners and supporters will find themselves in good company Nov. 30 at an international summit of high-power attendees from four countries working in a range of fields, including water, solar, transportation and biofuels.

San Diego’s clean-technology business owners and supporters will find themselves in good company Nov. 30 at an international summit of high-power attendees from four countries working in a range of fields, including water, solar, transportation and biofuels. Photo by Melissa Jacobs.

San Diego’s clean-technology business owners and supporters will find themselves in good company Nov...