In an 800-page assessment, the Nobel-winning Intergovernmental Panel on Climate Change (IPCC) says global warming will magnify the frequence and force of extreme weather events, and defences must be prepared now to avoid worse misery in the future.
"The character and severity of impacts ... depends not only on the extremes themselves but also on vulnerability and exposure," notes a draft "summary for policymakers" obtained by AFP.
The 20-page document is being vetting this week at a meeting of the 194-nation body in Kampala, Uganda.
UN Secretary-General Ban Ki-moon drove home the "be prepared" message at a climate forum in Dhaka on Monday.
"Natural hazards need not cause human catastrophe," he said. "There are many cost-effective remedies that communities and countries can take to reduce the impact of extreme weather events."
Poor countries with scant margin for manoeuvre will be hit first and hardest.
But the 2003 heatwave that killed 70,000 in Europe and Hurricane Katrina's flooding of New Orleans are deadly reminders that rich countries must brace for impacts too.
And beyond a certain threshold, the report cautions, all efforts to adapt may be overwhelmed unless the underlying carbon emissions that drive global warming are held in check.



