"If each launch requires 717 tons of methane, then the total amount of methane emitted for the rocket launches required to deploy the full Starlink constellation would be approximately 502,900 tons of methane." (1/2)
...(2/2)
"Assuming that each Starlink satellite needs to be replaced every five years, and that each launch carries 60 satellites, it would take approximately 140 launches per year to replace the satellites in the full 42,000 satellite constellation. If each launch releases 425 tonnes of CO2, then the total amount of CO2 emitted for the rocket launches required to keep the Starlink satellite fleet operational per year would be approximately 59,500 tonnes of CO2."
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