Technology
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What city's (nation's?) annual resource consumption and CO₂e emissions does $15b worth of GPU manufacture and subsequent mining most closely represent?
The GPUs will probably mostly be resold, so aren't completely wasted.
Will they not be very used and not so good anymore?
Mining on a GPU does tend to decrease its total lifespan but doesn't significantly impact its performance in the meantime. But even a heavily used GPU will often last a long time.