Sentences with phrase «methane emissions factors»

Not exact matches

Combining the generation data, project location, and eGRID emissions factor, NEC estimated the amount of carbon dioxide, methane, and nitrous oxide (measured together as metric tons of CO2 Eq.)

In this study, we created new per - animal emissions factors — that is measures of the average amount of CH4 discharged by animals into the atmosphere — and new estimates of global livestock methane emissions.»

The EPA's IG came back with a targeted reproach in 2014, questioning the validity of factors used to estimate methane emissions from some pipelines.

Many emission factors used to estimate releases of methane — a potent greenhouse gas associated with oil and natural gas development — are «far too low,» says Robert Howarth, an ecology and environmental biology professor at Cornell University.

At present, nations report methane emissions in terms of CO2 equivalents, using GWP100 as the conversion factor.

Although carbon dioxide accounts for the vast majority of greenhouse gas emissions from human activities, methane emissions are also an important factor driving climate change.

And finally, what about Mark's questions (# 3) and other factors not discussed here — do all these effects re Arctic ice lead scientists to believe there is a greater and / or earlier chance (assuming we continue increasing our GHG emissions — business as usual) of melting hydrates and permafrost releasing vast stores of methane into the atmosphere than scientists believed before the study, or is the assessment of this about the same, or scientists are not sure if this study indicates a greater / lesser / same chance of this?

It is shown that if global methane emissions were to increase by factors of 2.5 and 5.2 above current emissions, the indirect contributions to RF would be about 250 % and 400 %, respectively, of the RF that can be attributed to directly emitted methane alone.

I would like to see a discussion of the likelihood that factors traditionally viewed as slow response feedback factors (such as Arctic albedo, or high methane emissions permafrost degradation) may actually become faster response feedback factors.

The E.P.A. and EDGAR use a bottom - up approach, calculating total emissions based on «emissions factors» — the amount of methane typically released per cow or per unit of coal or natural gas sold, for example.

There are a number of factors that control CH4 concentrations that are extermely poorly understood and are mostly ignored in the scenarios — the dependence on other gases (such as O3, and CO), the impact of increased temperatures and changes to precip on tropical and boreal wetland emissions, the existence (or not) of a significant methane hydrate source from permafrost or continental shelves, the climate impact on the atmopsheric chemistry of CH4.

Let's err on the side of flamboyance (great word in this context) and say the concentration of methane in the air goes up by a factor of 10 for the duration of the extra methane emission (meaning that the lifetime doubles).

And finally, what about Mark's questions (# 3) and other factors not discussed here — do all these effects re Arctic ice lead scientists to believe there is a greater and / or earlier chance (assuming we continue increasing our GHG emissions — business as usual) of melting hydrates and permafrost releasing vast stores of methane into the atmosphere than scientists believed before the study, or is the assessment of this about the same, or scientists are not sure if this study indicates a greater / lesser / same chance of this?

While the greenhouse gas footprint of the production of other foods, compared to sources such as livestock, is highly dependent on a number of factors, production of livestock currently accounts for about 30 % of the U.S. total emissions of methane.316, 320,325,326 This amount of methane can be reduced somewhat by recovery methods such as the use of biogas digesters, but future changes in dietary practices, including those motivated by considerations other than climate change mitigation, could also have an effect on the amount of methane emitted to the atmosphere.327

Factors that affect ozone formation include heat, concentrations of precursor chemicals, and methane emissions.

After accounting for all the methane leakage factors mentioned by the Post, the NETL study clearly demonstrates that life cycle GHG emissions from LNG exports from the U.S. are significantly less than emissions from coal generated electricity in China and in Europe.

But there's an asterisk: the study's authors said their projections could be skewed by a lack of data on methane emissions from lakes throughout northern Alaska, which could factor into how much carbon is ultimately stored by the forests.

Current official inventories of methane emissions, a potent greenhouse gas released from landfills, livestock ranches and oil and gas facilities, may be underestimated both nationally and in California by a factor of about 1.5, according to new research from Berkeley Lab and others.

However, recently published scientific papers contravene this approach and indicate that (a) we just don't have substantial observational evidence yet to attribute cause to a the rise in methane, (b) methane emissions may not have increased recently after all, and (c) human activity (fossil fuel consumption) has not been the «dominant factor» driving the (assumed) increase in methane.

And methane emissions were more than three times greater in summer than in winter, so heat could turn out to be another factor.

Gregory, K., 1998: Factors affecting future emissions of methane from non-land - use sources.

EPA says emissions from field production of natural gas accounted for 32.2 percent of methane emissions from natural gas systems in 2012, but adds that those have come down more than 25 percent since 1990 — which is noteworthy when you factor in that natural gas production ramped up with the introduction of advanced fracking and horizontal drilling in the mid-2000s.

More complexity would slow this further, yet climate scientists at the Hadley Centre are already planning its successor — a model that can factor in the nitrogen cycle and methane emissions from thawing permafrost.

While methane and nitrous oxide make up much smaller portions of total greenhouse gas emissions, these gases are still important factors in the climate crisis, in part because they each have stronger global warming effects than carbon dioxide and also because they constitute an increasing portion of total emissions.

The worksheets available below constitute the details each entity's production of oil & NGLs, natural gas, coal, and cement from as early as 1854 to 2010, as well as additional sources of emissions (such as vented CO2, flared CO2, own fuel use, and vented or fugitive methane), non-energy uses of oil, gas, and coal, emission factors for each fuel, calculation of emissions attributed to each Carbon Major producer, and several summary worksheets by fuel and for cumulative emissions by all entities.

I suspect that given the paucity of knowledge in relation to clouds and aerosols (not to mention cycles)... the original X factors for the equation ranged through values that at the lower end produced no scary warming scenarios for the future doubling (ie at or lower than 1.5 C) to those that were very scary at 3 - 4.5 C — or even 6 C if you add strong feedbacks from melting ice, permafrost and emissions of methane.

The wide range is largely a result of differences in emissions of non-CO2 greenhouse gases, such as methane and nitrous oxide, which vary by a factor of between two and three across the models by 2100.