PARIS: World leaders, green groups and influencers reacted Monday to a “terrifying” UN climate science report with a mix of horror and hopefulness as the scale of the emergency dawned on many.

US presidential envoy on climate John Kerry said the IPCC report, which warned the world is on course to reach 1.5C of warming around 2030, showed “the climate crisis is not only here, it is growing increasingly severe”.

Frans Timmermans, the European Union’s deputy climate chief said the 3,500-page report proved “it’s not too late to stem the tide and prevent runaway climate change”. Britain’s Boris Johnson, whose government is hosting a crucial climate summit in November, said the assessment “makes for sobering reading”.

“I hope today’s IPCC report will be a wake-up call for the world to take action now, before we meet in Glasgow in November for the critical COP26 summit,” he said.

Climate report must be 'death knell' for fossil fuels: UN chief

Former Maldives president Mohamed Nasheed said the document confirmed that climate vulnerable nations were “on the edge of extinction”.

Saleemul Huq, director of Dhaka-based environmental think tank ICCCAD, said the IPCC report was “the final warning that bubble of empty promises is about to burst”.

He said it showed G20 countries needed to accelerate emissions cuts to ensure their economies are in line with the 1.5C target. “It’s suicidal, and economically irrational to keep procrastinating,” said Huq.

Dorothy Guerrero, head of policy at Global Justice Now, said the report was a “terrifying warning of our future unless drastic action is taken.”

“There is no denying the science of the climate crisis,” she said. “But policymakers refuse to face up to the fact that it is rooted in economics and a history of colonial exploitation.”

Many interpreted the IPCC’s assessment as a clarion call to overhaul the fossil-fuel powered global economy.