SHARM EL SHEIKH (EGYPT) – A fast-heating world “cannot afford a single gunshot”, Ukrainian President Volodymyr Zelensky told the UN climate summit on Tuesday, arguing that Russia’s invasion threatened international efforts to tackle global warming. Speaking by video-link to the COP27 climate talks in Egypt, Zelensky itemised the environmental fallout from the Russian assault on his country — from compelling countries to increase their use of coal to the disruption of grain supplies, worsening food crises stoked by drought. “We must stop those who, with their insane and illegal war, are destroy…