KATHMANDU, Aug. 9 -- As if the drought, wildfire and flood disasters this year were not bad enough, scientists have warned that unless the world reduces emissions of greenhouse gases drastically, these disasters will get much worse.

Hundreds of scientists spent the past two years drafting a 4,000 page report for the UN's Intergovernmental Panel on Climate Change (IPCC), but even as they did so, news of climate calamities were coming in thick and fast: heat waves, continental-scale wildfires, flash-floods, biodiversity loss.

A summary of the report for world governments was released on Monday, three months before world leaders meet in Glasgow in November for a Climate Summit called COP26 (Conference of Parties 26).

The highly technical Si...