SHARM EL-SHEIKH, Egypt — The world is getting hotter and more crowded, and the two issues are connected, but not quite as much as people might think, experts say.

On Tuesday somewhere a baby was born that was the globe’s 8 billionth person, according to a projection by the United Nations and other experts. The Earth has warmed almost 1.6 degrees Fahrenheit since the world hit the 4 billion mark in 1974.

Climate and population is a touchy subject for scientists and officials.

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