Pope Francis accused world leaders on Thursday of failing to listen to the concerns of youngsters pushing for global action against climate change.
In his annual speech to Vatican diplomats, the pontiff said climate change was a "concern of everyone," despite a tepid response from the international community.
"Many young people have become active in calling the attention of political leaders to the issue of climate change. Care for our common home ought to be a concern of everyone," he said.
"Sadly, the urgency of this ecological conversion seems not to have been grasped by international politics, where the response to the problems raised by global issues such as climate change remains very weak and a source of grave concern."
Since his papacy began in 2013, the Argentine pontiff has often argued for better protection of the environment. In April, he met teenage climate activist Greta Thunberg, who launched the Fridays for Future youth moment against climate change.
That movement has seen millions of people go on strike or spill into the streets demanding climate action.
Around the world, governments faced with a crescendo of deadly weather and dire alarms from science have failed to signal a real determination to act.
Francis said the UN conference in Madrid in December -- widely considered to have been a flop -- raised "serious concern about the will of the international community to confront with wisdom and effectiveness the phenomenon of global warming".
The climate crisis threatening the planet "demands a collective response capable of placing the common good over particular interests," Francis said.
He prayed for those affected by devastating fires in Australia and other areas of Oceania.
Australia's months-long bushfire disaster has killed at least 26 people, destroyed more than 2,000 homes and scorched some eight million hectares (80,000 square kilometres) -- an area the size of Ireland.
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