according to this [1] the US consumes ~8E6 million cubic feet of methane a year which is ~ 2.3E11 cubic meters which is ~ 1.5E11 kg of methane 1% of that wou

according to this [1] the US consumes ~8E6 million cubic feet of methane a year which is ~ 2.3E11 cubic meters which is ~ 1.5E11 kg of methane 1% of that would be 1.5E9 kg total fuel load of starship+super heavy nominally 4.5E6 kg just the methane is about 30% of that, so 1.4E6 kg so 1% of the total methane consumption of just the US is about a thousand flights a year. As other people have said, minimal. [1] https://www.eia.gov/dnav/ng/hist/n3035us2a.htm https://www.eia.gov/dnav/ng/hist/n3035us2a.htm