In 2016, the average annual electricity consumption for a U.S. residential utility customer was 10,766 kilowatthours

About 2.11 pounds of carbon dioxide are emitted into the atmosphere for every kWh of electricity generated by coal.

So the average household is putting out 10 tons a year. That's just for electricity though, that does not include emissions from heating or vehicles.

In 2017, there were about 126.22 million households in the United States.

10 tons each is 1262 million tons per year. Divided by 365=

3,500,000 tons per day compared to 20,000 tons per day.

The volcanoes on the sea floor are mostly hydrothermal vents that support chemical based ecosystems that eat whatever they emit, it does not go directly into the atmosphere like surface volcanoes.

There are about 30 active volcanoes on the surface.