It’s pretty much impossible to do anything without emitting *some* pollution somewhere down the line. Net zero doesn’t mean we aren’t creating any emissions, it means that of all the emissions we do make is removed from the atmosphere/environment. If we produce 10 tons of CO2, then remove 10 tons of CO2 from the atmosphere, it’s a net zero. There are many ways to do this – it’s possible to scrub carbon from the atmosphere, it’s possible to capture polluting gasses and particulates at the source and store them in safer ways than letting them disperse into the atmosphere, etc.
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