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Weather forecasting (short term details) may be wrong, but climate modeling (long term trends) is generally correct.

Just because we can't predict when an individual hurricane will occur doesn't mean that we can't predict "hurricane season".




Climate modelling on Earth generally refers to the scale of tens or hundreds of years, not to billions of years. Our climate model for the next few billion years is essentially "Eventually the sun will turn into a red giant". And we live here.

edit: Apparently it's not even certain whether the Sun will engulf the Earth or not!




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