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The aviation industry is responsible for 2.5% of the world's carbon emissions
A new study indicates that the aviation industry is responsible for up to 2.5 percent of the world's carbon emissions (inhabitat.com) 기타...
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When they calculate the 2.5% are they deducting the fuel that would otherwise be used? I'd like to see a comparison of the fuel used by a 737, say, between Houston and Dallas, and the fuel used by cars transporting the same number of people/luggage.
I guess I just needed to do a quick search:
http://paullaherty.com/2012/05/25/boeing-737-vs-toyota-prius-this-might-surprise-you/
http://paullaherty.com/2012/05/25/boeing-737-vs-toyota-prius-this-might-surprise-you/
That's fuel efficiency, not the same as carbon emissions.
Certainly not the same, but related. Fuel efficiency is directly proportional to carbon emissions for a given fuel type. Automobiles and planes both use hydrocarbon fuels last time I checked, with some notable exceptions. So the comparison is mostly valid.
To my knowledge airplane engines have no anti pollution devices as do vehicles and you say it makes no difference? Our modern diesel powered trucks put out water vapor for emissions. Particulates are virtually unmeasurable on them.
As I said earlier, would it make any difference if airplanes put out 10%? Not to me.
As I said earlier, would it make any difference if airplanes put out 10%? Not to me.
Whether an engine has anti-pollution devices plays no part in carbon usage, except that unburned fuel is wasted energy. Usually anti-pollution devices, like, for example, catalytic converters, facilitate burning whatever fuel didn't burn in the combustion chamber. Either way, carbon in equals carbon out. Without anti-pollution devices, the carbon out includes CO2, CO and various hydrocarbons. With anti-pollution devices, CO is reduced, hydrocarbons are reduced and CO2 is increased. But total carbon remains the same.
The vast majority of automobiles and planes both use hydrocarbon fuels, and the CO2 production per energy released by the fuel is almost identical between gasoline and jet fuel.
If you believe diesel fuel engines produce nothing but water vapor, you are sorely mistaken. Diesel has a lot of carbon, and while modern diesel engines don't produce soot (which comprise the particulates) like the old ones did, they still produce a lot of CO2 (not a particulate). The carbon has to go somewhere, and efficient engines produce a lot of CO2 when the fuel is carbon-based. There are not many fuels that are not carbon-based. An example would be hydrogen. Hydrogen engines produce water vapor emissions (and nitrogen oxides) but no carbon emissions. Diesel engines produce a lot of CO2, whether or not they produce particulates.
Jet engines, like diesel engines, used to put out a lot more soot than they do these days.
The vast majority of automobiles and planes both use hydrocarbon fuels, and the CO2 production per energy released by the fuel is almost identical between gasoline and jet fuel.
If you believe diesel fuel engines produce nothing but water vapor, you are sorely mistaken. Diesel has a lot of carbon, and while modern diesel engines don't produce soot (which comprise the particulates) like the old ones did, they still produce a lot of CO2 (not a particulate). The carbon has to go somewhere, and efficient engines produce a lot of CO2 when the fuel is carbon-based. There are not many fuels that are not carbon-based. An example would be hydrogen. Hydrogen engines produce water vapor emissions (and nitrogen oxides) but no carbon emissions. Diesel engines produce a lot of CO2, whether or not they produce particulates.
Jet engines, like diesel engines, used to put out a lot more soot than they do these days.
Didn't say pollution devices changed carbon usage. They change emissions to H2O and CO2 (black carbons eliminated). Jets emit HC, CO, NOx, SO2, and particulate matter. Pick your favorite carbon or other product of hydrocarbon fuels and breathe deep cause we're gonna be burning them for a long time. Lol. Have a good day. I'm going flying in this clear COLD air.
You said, "Our modern diesel powered trucks put out water vapor for emissions." False. They also put out CO2. Your omission of this point is relevant to the conversation, which is about carbon. The CO2 is where the bulk of the carbon goes - both for automobiles and airplanes.
