Christian Aid's youth and campaigns manager, Richard Baker, said: "The youth climate strikes have been nothing short of prophetic.
"One seemingly defiant act of protest by a 16-year-old girl in Sweden has grown into a thundering movement for change that is sweeping the globe.
"The climate strikers are pointing the way, it's now time world leaders and big business take heed and take action."
The statement comes ahead of a climate action summit in New York convened by the UN secretary general on Monday to urge countries to up their climate effort.
Baker added: "This week at the crucial summit in New York we need to see countries making new pledges to cut their emissions and stronger commitments to help the poorest communities already suffering from the climate crisis."
Meanwhile, Extinction Rebellion protesters gathered on Dover seafront to "blockade" the busy port on Saturday.
Two major roads out of the port are expected to be blocked for four hours, the environmental group has said.
The group said it's point out the vulnerability of the UK's food supply in the face of a climate emergency.
The "No Food on a Dying Planet" action at the Kent port is expected to be mirrored across the Channel by other Extinction Rebellion groups.
Rev Helen Burnett, curate at St Luke's Church in Whyteleafe, Surrey, took part in the protest and told Sky News action against global warming needs to happen immediately.
"We have a finite plant, we have finite resources and we can't continue to take those resources away and not replenish them and not regenerate them," she said.
An Extinction Rebellion spokesman said the group has assessed that the four-hour blockade between 11am and 3pm "will not cause any disruption to vital supplies" such as medicine.
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