Blame the mountains
Ah, those crystal-clear mountain streams. Turns out they emit a lot more CO2 than expected. The prevailing theory is that, despite picking up less carbon as they flow, mountain-streams’ turbulence means they “exchange gas with the air more quickly than placid streams do.”
In fact, in their study “The team found that by area, most mountain streams were net sources of CO2.”
Next up: How will this affect climate and carbon models?