In a word, humans! There’s pretty irrefutable evidence now that human activity is the cause of the current climate change we’ve been seeing, mostly from our burning of fossil fuels, producing CO2 and methane, and also by our industrial farming of cattle, who produce a significant amount of methane. We really need to put our focus into finding renewable sources of energy and cutting our CO2 and methane emissions before we push climate change to a point where it’s nearly impossible to pull it back.
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