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Comment 86 for 2022 Scoping Plan Update - Scenario Inputs Technical Workshop (sp22-inputs-ws) - 1st Workshop.
First Name: Thomas
Last Name: Conlon
Email Address: tconlon@geopraxis.com
Affiliation: GeoPraxis
Subject: CARB should replace CH4 GWP-100 metric to better fit CA near-term goals
Comment:
CARB should end the practice of continuing to use a single GWP-100 metric for all CH4 emissions as if they were: 1) physically the same (in their Global Warming Potential), and 2) consistent over the policy-defined time period of concern. Instead, CARB should develop a "multi-basket" or new metric approach (e.g., Combined-GTP or GWP*) which takes California's near-term (2030, 2035, 2040, 2045, and 2050) policy goals into account, and also more accurately accounts for the physical differences between CH4-fossil and CH4-nonfossil (including NO2) emissions, as outlined in IPCC AR6 WG I Section 7.6.1.4, Table 7.15, and Box 3, Physical considerations in emission-metric choice, p.1740/3949 of PDF). Most Respectfully Submitted, - Tom Conlon, GeoPraxis
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Date and Time Comment Was Submitted: 2021-10-22 23:27:12
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