The head of climate change policy at the United Nations has warned against political games stymieing the COP28 climate conference still under way in Dubai. “We all know the scale of the climate crisis,” Simon Stiell, head of the UN Climate Change Secretariat, said at the event in the United Arab Emirates city on Friday. “COP28 must be about solutions to get all countries out of this climate mess.” Ahead of crucial days of international negotiations before the summit’s end on Tuesday, Stiell said: “I don’t want to see diversions and political tactics that hold climate ambition hostage.” Comprom…