com/definition/english/net-2 : remaining after all factors have been taken into account; overall
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Cliveeg Some places were warmer, some were cooler. But when you calculate it all out, the world was cooler.Actually, I didn't understand it quite like that. My guess is that it means some environmental factors cause temperature increase, while others cause temperature decrease, but the latter outweigh the former (in whatever scenario is being described).