Swiss Re, the world's second-biggest reinsurer, has warned that the costs of global warming threaten to spiral out of control, forcing the human race into a catastrophe of its own making. In a report revealing how climate change is rising on the corporate agenda, Swiss Re said the economic costs of global warming threatened to double to $150 billion (R1 trillion) a year in 10 years, hitting insurers with $30 billion to $40 billion in claims.