Two years to the day since 195 nations sealed the Paris Agreement to avert worst-case-scenario climate change, investors announced billions of dollars of intended divestment from coal, oil, and gas at a finance-themed climate summit.
But conference host France, as well as the UN and the World Bank, warned that efforts to shift the global economy into a green energy future were too little, too slow.
"We are losing the battle," French President Emmanuel Macron told delegates. "We are not moving fast enough."
"We are in a war for the very existence of life on our planet as we know it," he told more than 50 heads of state including Mexico's Enrique Pena Nieto, Britain's Theresa May and Spain's Mariano Rajoy, at the summit called by Macron in response to US President Donald Trump's rejection of the 2015 Paris Agreement.
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America, a champion of the pact under Trump's predecessor Barack Obama, is the only country to reject it.
World Bank president Jim Yong Kim announced to loud applause Tuesday that the lender would "no longer finance upstream oil and gas after 2019".
"We're determined to work with all of you to put the right policies in place, get market forces moving in the right direction, put the money on the table, and accelerate action," he said.
French insurer Axa said it would speed up carbon sector divestment, pulling 2.5 billion euros ($2.9 billion) from companies which derive more than 30 percent of their revenues from coal.
Dutch bank ING said it would have "close to zero exposure" to coal power generation by 2025, and a group of more than 200 global investors, including banking giant HSBC, launched a campaign to pressure the world's largest corporate greenhouse gas emitters -- including BP, Airbus, Volkswagen and Glencore -- to go greener.
"While the challenge is great, we must do everything in our power to meet it. We know it is the difference between life and death for millions of vulnerable people around the world," said Frank Bainimarama, the prime minister of Fiji who presided over UN climate talks in Bonn last month.
On current emissions trends, the world is on course for warming of 3 C, experts warn, with life- and asset-threatening superstorms, sea-level rise, floods and droughts the result.
His rejection of the Paris pact was "politically short- sighted and misguided, economically irresponsible, and scientifically wrong," said former UN secretary general Ban Ki-moon.
But in the absence of a senior administration official, American businesses, regions and local government leaders have taken up the cudgels, represented in Paris by former New York mayor Michael Bloomberg, ex-governor of California Arnold Schwarzenegger, and Microsoft founder Bill Gates.
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