The act was linked to the “We Won't Pay for Fossil Fuels” campaign to stop public investment in, and subsidies of, fossil fuels, which are behind the greenhouse emissions causing the climate crisis.
The four activists were subsequently led away by police.
Earlier this week six UG activists linked to the same campaign went topless and blocked traffic in central Rome.
On Thursday six people sat down on a zebra crossing on the busy Via del Tritone leading to Piazza Barberini with “Stop Fossil” written on their backs, holding a banner saying “We Won't Pay for Fossil Fuels”.
In a statement, the group said that this week's deadly floods in the north-eastern region of Emilia Romagna were a dramatic demonstration of how the climate crisis was having an impact on people's lives.
“We go naked with our bodies, vulnerable like the planet,” the statement said.
Other UG protests have included splashing easy-to-wash-off paint over the front of the Senate in Rome, the La Scala opera house and the Vittorio Emanuele II statue in Milan and sticking themselves to Botticelli's Spring at the Uffizi and the Laocoon statue in the Vatican, as well as blocking the Mt Blanc Tunnel, throwing flour over an Andy Warhol car in Milan, and throwing soup onto a Van Gogh in Rome.
In the light of such acts, the government has approved a crackdown on art ‘eco-vandals’, with fines of up to €60,000.
UG is part of the A22 network of climate civil-disobedience groups in several countries, including Just Stop Oil in the UK, Stop Old Growth in Canada, France's Derniere Renovation and Declare Emergency in the United States.
ANSA
