When greenhouse gas emissions are left out of climate models, leaving only natural factors (solar variability and volcanic emissions), how do the modeled temperature trends compare to observations in the last 30 years of the 20th century? Choose the best answer. Modeled temperatures with only natural variability are warmer than observed temperatures Modeled temperatures with only natural variability are cooler than observed temperatures Modeled temperatures with only natural variability are about the same as observed temperatures Modeled temperatures with only natural variability are warmer than observed temperatures from 1960-1980 and cooler than observations after that.

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