They said the portraits were stolen from various town halls over the past months, as they joined anti-government protests against Macron's reforms. Sunday's demonstration coincided with the annual U.N.
Climate summit in Madrid, which opened last Monday (December 2).
Recalling the 2015 Paris climate agreement, where countries set goals to cut down carbon emissions, activist Pauline Boyer said Macron had not put in place a strong enough climate policy that measures up to the challenge.
France is falling way short of its self-set climate targets as carbon emissions from transport and buildings are not dropping as planned and the government will have to triple its efforts to get back on track, the country's climate council said last July.
By the end of the COP25 in Madrid on December 13, negotiators hope to resolve remaining disagreements on how to implement the Paris accord to avert catastrophic global warming.