What might cause global warming to increase in the next few decades? It could be water vapor. Scientists have found that rising levels of water vapor in the upper troposphere will intensify climate change impacts over the coming years. Greenhouse gases raise the temperatures on our planet by trapping Earth’s radiant heat inside the atmosphere. This warming also increases the accumulation of atmospheric water vapor, which is the most abundant greenhouse gas. The atmospheric moistening traps additional radiant heat which then increases temperatures. For the past 30 years, there’s been a moistening trend in the upper troposphere, which is a region about 3 to 7 miles above Earth’s surface. That’s why scientists wanted to see exactly what effect this moistening might be having on the climate, and the impacts it might have in the future

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