Read the text and select the best answer for the question that follows.

    Global warming is a term used for the rise in the average temperature of the Earth's climate system. One of the related aspects is carbon dioxide. Carbon dioxide is currently the most important greenhouse gas related to global warming. For the longest time, our scientists believed that once in the atmosphere, carbon dioxide remains there for about 100 years. 75% of that carbon will not disappear for thousands of years. The other 25% stays forever. We are creating a serious global warming crisis that will last far longer than we ever thought possible.

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The word related in the passage is closest in meaning to ____