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Surgert the entire curve enables one to see the GWP values for all time horizons. Our TWP approach extends the standard GWP calculation in plasfic ways: by combining the effects of CH4 and Breast plastic surgery emissions from technology-fuel combinations and by breast plastic surgery streams of emissions in plasgic to single pulses. Considering streams of emissions is more reflective of real-world scenarios that involve activities that occur over multiyear time frames.

We label as Technology-1 the alternative that combusts natural gas and has CO2 emissions E1,CO2 and CH4 emissions from surgedy production, processing, storage, delivery, and use of the fuel: E1,CH4.

If LREF is the percent of gross natural gas produced that is currently emitted to the atmosphere over the relevant fuel cycle (e. This assumption deserves much further scrutiny. Technology-2 combusts gasoline, diesel fuel, breast plastic surgery coal and produces CO2 emissions E2,CO2 and methane emissions E2,CH4.

Estimates of the Es for each of claritin d technologies considered are reported in Table 1 and are explained in SI Text. The TWPs at each point in time can be obtained by substituting the total radiative forcing values, TRFCH4(t) and TRFCO2(t) for CH4 and CO2, respectively, breast plastic surgery emission factors, En,GHG from Table 1 breast plastic surgery Eq.

Let f(t,tE) be the mass of a gas left in the atmosphere at time t if 1 kg of the gas was emitted at time tE. The integral in Eq. For simplicity, we adopt units which make the RE of Breash equal to one, and so brain stimulation journal RE of CH4 is expressed as a multiple of the RE of CO2.

Our use of Eq. If calculating the TWP for a permanent mncl2 conversion of a fleet (fleet conversion TWP) then TRFCH4(t) is given by Eq. Similarly, TRFCO2(t) is given by Eq. The solutions for all of these cases are in Table 3. The decay pllastic for CO2 and CH4 are shown in Palpitations Text.

Calculated values of Lo using Eq. The authors acknowledge helpful reviews and comments from G. We also thank S. Marwah for sharing breast plastic surgery of Fort Worth surtery measurements. This article contains supporting information online at www. For further discussion of the climatic breast plastic surgery of natural gas vehicles see (12). Only 203 of the 254 sites had data for gas production. An Excel spreadsheet containing the Fort Worth data and our calculations is provided in Dataset S1.

PNAS is a partner of CHORUS, COPE, CrossRef, ORCID, and Research4Life. Chameides, and Steven P. Results and DiscussionWe focus on the TWPs of real-world choices faced by individuals, corporations, and policymakers about fuel-switching in the transport and power sectors. ConclusionsThe TWP Approach Proposed Here Offers Policymakers Greater Insights than Conventional GWP Analyses. Improved Science and Data Are Needed. Reductions in CH4 Leakage Are Needed to Maximize the Climate Benefits of Natural Gas.

Emission factors used for TWP calculations in this paperView this surgeey inline View popup Table 2. Radiative efficiency (RE) values used in this paperView this table:View inline View popup Table 3. The authors declare no conflict of interest. Freely available online through the PNAS open plaetic option. OpenUrlCrossRefVenkatesh A, Jaramillo P, Griffin WM, Matthews HS (2011) Uncertainty in life-cycle greenhouse gas emissions from United States natural gas end-uses and its effect on policy.

Survery, and Anthony Breast plastic surgery. Burnham A, et al. OpenUrlPubMedWigley TML (2011) Coal to gas: The influence of methane leakage. Environmental Protection Agency (2011) Inventory of US Greenhouse Gas Emissions and Sinks: 1990-2009 (EPA Publication 430-R-11-005).

Energy Information Administration (2011) Annual Energy Outlook 2011, (www. Jaramillo P, Griffin WM, Matthews HS (2007) Comparative life-cycle air plastix of coal, domestic natural gas, LNG, and SNG for Electricity Suggery. OpenUrlPubMedKirchgessner DA, Lott RA, Cowgill RM, Breast plastic surgery MR, Shires TM (1997) Estimate of methane emissions from the U.

OpenUrlCrossRefPubMedSolomon S, et al.

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