That's only half the quote

The US power sector would emit 2.1 billion metric tons of carbon dioxide by 2030, after factoring in planned AI projects, which is 618 million tons more than 2025 levels, or about a 42% increase.

So the estimated total increase is 618 million tons

The bulk of the expected emissions by 2030 would come from sources that are not directly linked to the grid, often built by tech companies to avoid the long wait for a connection. These could exceed 460 million tons, Fisher said, roughly the same as the annual emissions of Mexico.

So over 460 million tons of the 618 estimate is primarily datacenters, nearly 3x of the rest of the country, which is only using 158 tons more.

The Bloomberg article (archive link) cites several studies that make different projections about the amount emissions will increase, but all agree that the cause is additional fossil-fuel-based power generation for AI data centers. There's consensus that the cause of severely increased US emissions is AI data centers. No one is suggesting it comes from anywhere else.

They write with such a heavy anti AI bias, that i can't trust anything they puplish about the subject any longer. I am critical of AI myself, but i don't want journalism to uncritically engage with any subject.