Zero fossil fuel energy, zero gas-guzzlers on the road, zero waste, zero CO2 emissions -- dozens of cities, regions and companies made "zero" pledges Thursday at a global climate summit in San Francisco.
The mayors, governors, and CEOs from around the world have stepped into the climate breach with concrete action as UN talks to implement the Paris climate treaty falter, and President Donald Trump dismantles US policies to curb greenhouse gas emissions.
Jointly organized by California governor Jerry Brown and former New York mayor Michael Bloomberg, the three-day gathering is a showcase for initiatives, big and small, to reduce humanity's carbon footprint.
On Thursday, dozens of states, regions and major cities committed to allowing only zero-emission cars, buses and trucks on their roads within a few decades. Tokyo, Seoul and Rotterdam, meanwhile, joined Paris, London, Barcelona and Mexico City in vowing to run only electric buses by 2025.
Entertainment and electronics giant Sony Corporation committed this week to running its global operations only with renewable energy, joining more than 140 multinationals -- three-quarters of them having pledged to do so before 2030.