LOS ANGELES—Los Angeles City Councilwoman Nithya Raman announced plans Feb. 9 for a proposed ordinance that would require all new construction buildings in Los Angeles to be zero-carbon. Buildings in Los Angeles account for 43 percent of the city’s greenhouse gas emissions, more than any other sector, she said. Under her proposal, new zero-emission construction would not include gas lines, with heating systems and other appliances operated by electricity. Appliances in the buildings would also have to be energy efficient. Once Los Angeles transitions to 100 percent renewable energy—which the city aims to achieve by 2035—the buildings would operate on the Los Angeles Department of Water and Power’s carbon-neutral grid. “This is such a critical moment for us to be engaging in this work. We are seeing rising temperatures, the risks of more dangerous wildfires, more serve droughts, more deaths from heat exposure, we’re seeing a worsening air quality threaten …