Re: Car taxes to be linked to CO2 emissions? The BS Brigade (National Auto Policy) are at it again. I appreciate the intention of the agencies worldwide to try and bring the emissions down.. however the elephant in the room is never acknowledged, instead everyone turn the other way and somehow look for ways to ignore the elephant. This has rung true ever since European emission authorities started pushing diesels claiming better economy and hence, lower CO2 emissions compared to petrols, when in reality high volumes of NOx started to get released into the air, causing breathing problems, lung infections, vision problems and even being the root cause for many carcinogens entering the human body.
The focus is now again into CO2 and not NOx, will diesels get a free pass once more?
The more interesting question is, how does one determine the exact output of CO2 into the atmosphere when speed isn't a constant? Quote:
Laboratory studies have provided a foundation of knowledge regarding vehicle emissions, but questions remain regarding the relationship between on-road vehicle emissions and changes in vehicle speed and engine load that occur as driving conditions change. Light-duty vehicle emissions of CO, NOx, and NMHC were quantified as functions of vehicle speed and engine load in a California highway tunnel for downhill and uphill traffic on a ∼4% grade. Emissions were measured throughout the day; average speed decreased inside the tunnel as traffic volume increased. Emissions of CO were typically 16−34 g L-1 (i.e., grams of CO emitted per liter of gasoline consumed) during downhill driving and ranged from 27 to 75 g L-1 during uphill driving. Downhill driving and moderate-speed uphill driving resulted in similar CO emission factors. The factor of 2 increase in CO emissions observed during higher-speed uphill driving is likely evidence of enriched engine fuel/air ratios; this was unexpected because uphill driving observed in this study occurred at moderate engine loads within the range experienced during the city driving cycle of the U.S. emissions certification test. Emissions of NOx (as NO2) were typically 1.1−3.3 g L-1 for downhill driving and varied between 3.8 and 5.3 g L-1 for uphill driving. Unlike observations for CO, all uphill driving conditions resulted in higher NOx emission factors as compared to downhill driving. NOx emissions increased with vehicle speed for uphill driving but not as strongly as CO emissions. Emissions of CO and NOx are functions of both vehicle speed and specific power; neither parameter alone captures all the relevant effects on emissions. In contrast to results for CO and NOx reported here and results for NMHC reported previously by Pierson et al. (Atmos. Environ. 1996, 30, 2233−2256), emissions of NMHC per unit of fuel burned for downhill driving were over 3 times greater than NMHC emissions for uphill driving. Emission rates of CO and NOx varied more with driving conditions when expressed per unit distance traveled rather than per unit fuel burned while NMHC emission rates normalized to distance traveled were approximately constant for uphill versus downhill driving during peak traffic periods.
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[1]
CO2 is the chemical shorthand for carbon-dioxide, its an essential gas that creates livable temperatures in order for all life to sustain. Trees need CO2 and consume CO2 to the extent of 22 kgs of CO2 per annum.. of course it is said that 900 trees are required to offset the unnatural CO2 emission caused by 1 human being and his lifestyle (flatulence included, yes now we're diving into details). So that settles it, trees cannot help save the day when it comes to mankind's modern living ways. Much of the CO2 is also from emissions when refining oil and natural gas, it starts well before the fuel even reaches your tank.
So far we know that the variation of CO2 output from an automobile depends on multiple factors 1) Average speed 2) Tendency of the driver (whether sudden acceleration is done which increases fuel consumption or sudden braking is done constantly which reduces leverage of engine power to go that extra mile 3) Altitude of the road over which the car is being driven 4) Type of engine 5) Traffic situation. Of 5 factors, the only calculation being done is of engine specification and laboratory testing results in order to determine taxes? How would this leverage towards lower emissions? Also if one dives deeper down, kerb weight, laden weight (number of passengers) also influence economy and emissions. [2]
The conclusion : Its up to each and every one of us to drive responsibly, flog a vehicle for as long as possible so that more CO2 emissions aren't created during production of a new car. People may say that it's the little ways of change in which this beautiful earth can become better.. yes I agree, but now more than ever, its time to accelerate the healing process of this earth and its atmosphere, without it there shall only be sickness and destruction until all crease to exist. Its great to have the budget and go all out to buy a big car, however, restraint in driving it, using it till its near end-life and not counting on mere taxation in defining our eco-friendliness is the need of the hour. I hope this post is taken in the right spirit. Quote:
Producing a medium-sized new car costing £24,000 may generate more than 17 tonnes of CO2e – almost as much as three years' worth of gas and electricity in the typical UK home.
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[3] https://pubs.acs.org/doi/abs/10.1021/es0263588 [1] https://www.eea.europa.eu/themes/transport/speed-limits [2] https://www.theguardian.com/environm...tprint-new-car [3] |