The Paris climate pact is 5 years old. Is it working?

When world leaders celebrated reaching a landmark climate change agreement in Paris in December 2015, the Eiffel Tower and Arc de Triomphe were illuminated with green floodlights and the message “Accord de Paris c’est fait!” (the Paris agreement is done!). Now, five tumultuous years later, a new slogan might be “travail en cours” (work in progress).

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