Diplomats from 196 countries prepared to vote on a far-reaching climate accord that seeks to halt the rapid growth of man-made greenhouse gases in the atmosphere and prevent a dangerous warming of the planet.

Cloud cover at night traps heat and can hasten melting.

The United Nations says a record 155 countries will sign the landmark agreement to tackle climate change at a ceremony at U.N. headquarters on April 22. U.N. spokesman Farhan Haq said Friday that five countries, Barbados, Belize, Tuvalu, Maldives and Samoa…