In the daunting math of climate action, individual choices and government policies aren’t adding up.

Solar panels are being nailed to rooftops, colossal wind turbines bestride the plains and oceans, and a million electric vehicles are on U.S. roads — and it isn’t enough. Even if the world did an unlikely series of about-faces — halting deforestation, going vegetarian, paying $50 a ton carbon taxes, boosting energy efficiency, doubling car mileage, and more — it would not be enough.

“There’s no silver bullet,” said Andrew Jones, co-founder of the modeling firm Climate Interactive. “There’s silver buckshot: many actions in many domains.”

As the 24th U.N. conference on climate change kicks off this week, a steady drumbeat of scientific reports have sounded warnings about current climate trajectories. One warned of the need to curb global warming to 1.5 degrees Celsius — 2.7 degrees Fahrenheit — over preindustrial levels instead of the widely accepted target of 2 degrees Celsius. Another warned of the growing gap between the commitments made at earlier U.N. conferences and what is needed to steer the planet off its current […]

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