I see this talking point rattled off a lot but it makes no sense.

Concentrating in one spot will be more efficient but cause more damage than dispersing.

The efficiency you gain in centralizing is irrelevant since you lowered the total but concentrated it so it can grow instead of disperse.

Which is worse, dumping a ton of salt in one spot in the ocean or dumping 1.2 tons throughout a large area?

There's a reason cities generally have smog and towns generally don't.

Dilution is the solution to pollution.