Without trillions of dollars invested in clean energy technology, the Paris Agreement's goal to keep global warming below two degrees Celsius (3.6 degrees Fahrenheit) over pre- industrial levels will remain a pipe dream, participants warned.
"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.
French President Emmanuel Macron gathered some 60 world leaders, partly in response to US President Donald Trump's announcement in June that he would pull America out of the Paris pact which had taken nearly 200 nations more than two decades to negotiate.
About 200 protesters gathered in the Paris streets, meanwhile, demanding that France pays "not a single euro more for fossil energy".
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Trump, who has described climate change as a "hoax", has withdrawn billions of dollars in climate finance -- including an outstanding $2 billion out of $3 billion the US, under his predecessor Barack Obama, had pledged towards the Green Climate Fund.
Macron Tuesday called for "much stronger mobilisation" by remaining partners.
"We are very far from the goal of the Paris agreement of limiting the rise in temperatures to below a two-degree threshold," he told Le Monde newspaper.
Money has long been a sore point in the UN climate process, with developing nations insisting on aid to ease the costly shift to less-polluting energy sources, and to shore up defences against climate-change induced weather disasters.
Also absent were the leaders of major polluters China, India, Brazil, Russia and Canada, Germany's Angela Merkel, and European Commission president Jean-Claude Juncker.
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