Data centres are about 1% of total GHG emissions according to the IEA. AI is currently about 15% of data centre energy usage. That makes AI responsible for about 0.15% of GHG emissions. AI is not a major source of GHG emissions.

my previous job was building greenhouse gas inventories at the national, state and city levels.

Electricity generation is about 1/3 of global emissions; 3% of that would be less than 1% of global emissions for all data centres.

Even given the numbers you're sharing, and even if AI were responsible for all data centre energy use, AI is not a major source of GHG emissions compared to transportation (15%), cattle (7%), cement production (8%), deforestation (15%) or rice cultivation (3%).