When President Trump announced the US departure from the Paris Climate Accord on 1 June 2017, his enjoyment at walking over the efforts of national delegations and hundreds of pressure groups across the world who fought for that deal was palpable. I was in Paris in December 2015 during the negotiations, when the possibility of a global agreement was merely that, a fragile potential.
On the one-year anniversary of the massive BP oil spill in the Gulf of Mexico, artist-activists at Liberate Tate staged a guerrilla performance in the Tate Britain galleries to highlight the museum's ties to BP.