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In the Alpine regions of Europe, you see this a lot - areas in the valleys that can be used for crop farming, are farms (at least if they're not built up) and the cows graze in the summer on the higher-up slopes and meadows where you mostly couldn't grow wheat at all, and even if you could you wouldn't get a combine harvester up that kind of incline to harvest it efficiently.

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And then emit higher methane in the process even in areas where it could theoretically work out largely due to lower slaughter weights and longer times to raise them

>If beef consumption is not reduced and is instead satisfied by greater imports of grass-fed beef, a switch to purely grass-fed systems would likely result in higher environmental costs, including higher overall methane emissions.

https://iopscience.iop.org/article/10.1088/1748-9326/aad401

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