Graffiti artwork, suspected to have been created by the British street artist Banksy, is pictured.
A new work believed to be by British street artist Banksy appeared near London's Marble Arch on Friday, where climate change protesters have camped out for days.
The work features a child clasping a symbol of Extinction Rebellion, the group behind the protests, crouching next to a spade and a new plant.
"From this moment despair ends and tactics begin
"I think it's virtually a certainty it's him," auctioneer Andrew Tetley told London's Evening Standard newspaper.
"It hasn't been confirmed obviously that it is Banksy yet, but clearly there's a lot of excitement," added street art fan Lindsey Solomons, 53.
"I think the message speaks for itself really, that if we don't do something about the planet clearly we're going to be in a desperate state, and he captures that so well," she told AFP.
Environmentalists used festive but highly disruptive rallies since last week to focus global attention on climate change, bringing parts of London to a standstill.
The entire campaign saw police make 1,130 arrests and press charges against 69 people.
Banksy, whose identity is known to only a handful of friends, caused a sensation in October when one of his paintings began shredding itself, just after selling for $1.4 million (1.2 million euros).
The artist has previously espoused themes such as immigration and refugees, the Palestinian cause and the yellow vest movement in France.
Chinese artist Ai Weiwei unveiled a new installation in Mexico that tells the story of 43 students likely massacred five years ago in a case that exposed government stonewalling and complicity in abuses, a frequent theme for the dissident artist.
Researchers at the Uffizi Gallery in Florence have proved what was suspected for a long time: that Renaissance genius Leonardo Da Vinci was able to write, draw and paint with both hands.
The high-tech future of green jobs and the Gandhian virtue of the dignity of work meld their messages on a six-storey high mural commemorating the 150th birth anniversary of Mahatma Gandhi and the centenary of the International Labour Organisation (ILO).
Adele also discussed the postponement of her Las Vegas residency at the Colosseum at Caesars Palace.
In a new interview, Chris Weitz, who directed the second Twilight film, revealed that he reluctantly had to deny her the part of an extra in the background.
Due to my fixation on privacy pertaining to my personal life, it took a lot of time, and a lot of prodding by loved ones, to finally get me to do this," Smith said in a statement.