There are 50 to 60 satellites per launch. So that would be on the range of 800 launches x 425 then divide by 4.6 per car per year and it’s still only 75,000 cars for one year. Space launches are a very small percentage of CO2 contributions.
Sent from AT&T Yahoo Mail for iPhone On Friday, January 7, 2022, 2:20 PM, EV List Lackey via EV <[email protected]> wrote: On 7 Jan 2022 at 14:24, paul dove via EV wrote: > Be interested to see those numbers. Sure. Sorry that I didn't save links to my sources, but you're welcome to look them up for confirmation or correction I think that most of them were US federal agencies - DOE, EPA, maybe NASA. Spacex plans to launch 42,000 satellites. (I said 40,000 in a previous post, but I was remembering incorrectly.) I haven't found a time frame for those launches, but the total number is frequently quoted in many news reports. By the way, I'm not an expert, but that is a LOT of orbital congestion, IMO. Each satellite launch releases almost 340 metric tonnes of CO2. That's a total of 14.3 million tonnes. If your number (425 tonnes per launch) is correct, it would be 17.9 million tonnes. To simplify the math, I made a few assumptions and omissions. - Over the period in question, US Tesla sales dominate, therefore I can use US average yearly driving mileage (14,300). Many Teslas are sold in California and their yearly mileage is somehwat higher, but it's not enough to change the conclusion significantly. - The national power mix and CO2 output applies. In reality there are more Teslas in the west, so differences in Western power generation CO2 emissions may affect the totals. Calculating this would have required separating out Tesla sales and power generation by state or even more finely. I didn't have the patience for that, but I'd be happy to see someone else do it. - Tesla energy use will vary somewhat by model, but I used an average. I don't remember where I got that average or how current it is. - I considered only what the vehicles consume in driving energy, not what CO2 is emitted in manufacturing the cars and parts and transporting same. Average ICEV CO2 emissions are 0.404kg per mile. On average a Tesla uses 0.34 kWh per mile. US average power generation produces 0.386kg per kWh, so a Tesla releases 0.131kg/mi of CO2, for a net reduction vs an ICEV of 0.273 kg/mi. BTW, this once again disproves the "smokestack myth." I then made a simple spreadsheet with the number of cars Tesla has sold each year since 2012 (ignoring the negligable number of roadsters sold), the estimated number of miles driven by the owners of those Teslas, the cumulative miles driven, and the cumulative reduction in CO2 emissions vs those same drivers using an average ICEV. By the end of 2020, the cumulative CO2 reduction from Tesla EVs was 13.7 million metric tonnes, which is pretty impressive. However, the launch of Spacex's 42,000 satellites will emit 14.3 million tonnes or 17.9 million tonnes, depending on your source, as stated above. Either way, Musk's satellites will wipe out all of the decarbonization that his EVs accomplished from 2012 to 2020. Some people consider Elon Musk an environmental champion. That too is interesting. David Roden, EVDL moderator & general lackey To reach me, don't reply to this message; I won't get it. Use my offlist address here : http://evdl.org/help/index.html#supt = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = I was gratified to be able to answer promptly, and I did. I said I didn't know. -- Mark Twain = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20220107/b9b10391/attachment.html> _______________________________________________ Address messages to [email protected] No other addresses in TO and CC fields UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub ARCHIVE: http://www.evdl.org/archive/ LIST INFO: http://lists.evdl.org/listinfo.cgi/ev-evdl.org
