That 41g / km
emissions figure compares favourably with the Audi A3 e-tron (38g / km) and family friendly VW Passat GTE (39g / km), but isn't quite a match for the Prius Plug - in (22g / km) or BMW i3 (12g / km).
Not exact matches
Pierrehumbert said Howarth uses the
figure for methane's 20 - year global warming potential — 86 times that of carbon dioxide — without seriously discussing the magnitude of warming caused by those methane
emissions compared to warming prevented by the reduction in carbon dioxide
emissions.
But this electric vehicle results in 53 percent lower overall
emissions compared with a similar gasoline vehicle (see
Figure ES - 2).
Still, the extra mass isn't free and the xDrive pays for it in fuel consumption, where it adds 0.7 L / 100 km to the rear - drive car's 7.0 - litre
figure, resulting in CO2
emissions of 177g / km
compared to the lighter car's 159.
The 120PS (118 hp, 88 kW) Flexifuel engine delivers virtually identical performance
figures to the conventional 125PS version, while the Flexifuel model achieves CO2
emissions of 132 g / km (running on E85 fuel)
compared to 136 g / km for the 125PS engine.
Compared to the diesels, the 1.6 - litre T - GDi turbo petrol looks uncompetitive with CO2
emissions figures of over 170g / km.
Business users will also want to consider the Civic's surprisingly high 117g / km CO2
emissions, which don't
compare favourably to the 109g / km
figure of the 1.0 - litre TSI fitted to the VW.
Same goes for EPA numbers: according to MB, since the 4MATIC system has the least parasitic effect on both
emissions and fuel economy
compared to their German rivals, city / highway mpg
figures of 16/24 for the sedan and 15/23 for the wagon seem not far off the mark.
The S4 Avant, with its turbocharged 3.0 - litre V6, also achieves a claimed fuel economy of 37.6 mpg and 175g / km CO2
emissions,
compared with the 38.1 mpg, and under 170g / km CO2 Audi claims for the S4 saloon, although Audi has stated that these
figures are not yet officially confirmed.
This new V8 also delivers better fuel consumption and
emission figures (40 percent lower when
compared to the 6.0 - litre W12) not only due to its smalled displacement but also due to advanced technologies such as direct injection, variable displacement and the new close - ratio 8 - speed transmission.
When you look at real world scenarios, including studies that look at actual trajectories in
emissions compared with the cuts needed for 2 degrees (see, for example,
figure SPM.5, left panel or the very influential Peters et al 2012 article) a totally different picture emerges.
So the number is a net
figure to be
compared to the net
emissions (the human part of the gross
emissions which includes the
emissions from vegetation).
But he's gone further, building interactive images that mesh data and graphics in novel ways, including the
figure below, which
compares the cumulative
emissions of the world's nations, large and small.
And then
figure the overall effects on the world of the «before» situation &
compare with what is & will happen «extra» with the human
emissions.
To properly put this
figure in perspective, the gross
figure 123 PgC / yr should have been used, if it is
compared to the gross fossil fuel
emissions of 8 PgC / yr.
In order to
compare their projections with actual
emissions I had to manually scale bars on their
figures.
Figure 5
compares the IPCC SAR global surface warming projection for the most accurate
emissions scenario (IS92a) to the observed surface warming from 1990 to 2012.
Figure 3 accounts for the lower observed GHG
emissions than in the IPCC BAU projection, and
compares its «Best» adjusted projection with the observed global surface warming since 1990.
Figure 1: Observed global CO2
emissions from fossil fuel burning and cement production
compared with IPCC
emissions scenarios.
By 2100, the A2 marker has the largest CH4
emissions in all the regions as
compared to the other markers (Tables 5 - 13a - d,
Figure 5 - 17).
Posted by Olive Heffernan on behalf of Paty Romero Lankao It does make sense to
compare the per capita CO2
emissions of Mexico City and Los Angeles (see
figure below) to illuminate the debate on shared but differentiated responsibilities on greenhouse gases
emissions and show that just as urban centers register different levels and paths of economic development, cities do not contribute at the same level to global warming.
It does make sense to
compare the per capita CO2
emissions of Mexico City and Los Angeles (see
figure below) to illuminate the debate on shared but differentiated responsibilities on greenhouse gases
emissions and show that just as urban centers register different levels and paths of economic development, cities do not contribute at the same level to global warming.
We can observe this phenomenon in
figure 1 by
comparing the lowest green and yellow
emission pathways and temperature trajectories.
Although we did not explicitly address the temporal or spatial resolution of
emission data from each system, it is notable that the few published acoustic and eddy covariance - based reservoir CH4 flux estimates are quite high
compared to the median CH4 flux estimates from less temporally and / or spatially integrated measurement techniques (
figure 1).
Changes in CO2
emissions attributed to Kaya Identity factors from 2015 to 2016
compared with the trend from the prior decade: This
figure gives context to the most recent year ‐ to ‐ year change by
comparing it to the average change for key parameters over the previous decade.
Figure 16.2: Projected number of days per year with a maximum temperature greater than 90 °F averaged between 2041 and 2070,
compared to 1971 - 2000, assuming continued increases in global
emissions (A2) and substantial reductions in future
emissions (B1).
Figure 2: The decadal land surface temperature from the BEST average (black),
compared to a linear combination of volcanic sulfate
emissions and the natural logarithm of CO2 (red).
Much of the southern portion of the region, including the majority of Maryland and Delaware, and southwestern West Virginia and New Jersey, are projected by mid-century to experience many more days per year above 90 °F
compared to the end of last century under continued increases in
emissions (
Figure 16.2, A2 scenario).
Although the latter
figure was originally proposed by the European Commission, it has been criticized for falling short of the levels that would be needed to achieve a minimum target of 80 per cent greenhouse gas
emissions reductions (
compared to 1990 levels) put forward in the 2050 Low - Carbon Roadmap.
As a result, 2040 CO2
emissions are reduced by over 400 million metric tons (21 percent)
compared to a projection with no Clean Power Plan and by nearly 830 million metric tons (35 percent)
compared to 2005 levels (see
Figure 1).
Although energy efficiency can be used to displace generation and reduce
emissions, the AEO 2016 Reference case models achieving Clean Power Plan compliance with only a 3 percent decrease in sales
compared to the future with no Clean Power Plan (see
Figure 2).
Figure 4 - B
compares the Bern formulas that, according IPCC, say the part of the anthropic
emissions still in the air after t years
Figure 1: Industry plans versus climate safety: Rates of change (base year 2010 = 100) of global
emissions in a range of 1.5 or 2 degree Celsius scenarios,
compared with
emissions from global developed and undeveloped oil and gas fields.
National
emissions changed substantially in 2017
compared to 2016 for several countries (see
figure).
But if we
compare the amount of capacity needed to replace the
emissions from 100 million tonnes of coal, the
figures are not the same.