Times (UK): When Marika Holland announced the imminent demise of the Arctic ice cap 18 months ago, she was worried. Her findings, based on predictions from one of the world’s most powerful super-computers, had been double-checked and peer-reviewed – but they still seemed extreme. “We were suggesting the Arctic ice cap could disappear in a few decades,” said Holland, a senior researcher at America’s National Centre for Atmospheric Research in Boulder, Colorado. “We were confident of our …