Talk:Hydrofluorocarbon

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The second paragraph ("Fluorocarbons with few...") is talking about fluorochemicals in general, and not about HFCs; 5-fluorouracil is not an HFC. I suggest removing the paragraph completely.

Also, some example HFCS would be good. I guess Wiki already has pages for them? F2Andy (talk) 10:10, 18 January 2018 (UTC)[reply]

From IPCC :: Anthropogenic and Natural Radiative Forcing — 2018

The net forcing by WMGHGs other than CO2 shows a small increase since the AR4 estimate for the year 2005. A small growth in the CH4 concentration has increased its RF by 2% to an AR5 value of 0.48 (0.43 to 0.53) W m–2. RF of nitrous oxide (N2O) has increased by 6% since AR4 and is now 0.17 (0.14 to 0.20) W m–2. N2O concentrations continue to rise while those of dichlorodifluoromethane (CFC-12), the third largest WMGHG contributor to RF for several decades, is falling due to its phase-out under the Montreal Protocol and amendments. Since 2011 N2O has become the third largest WMGHG contributor to RF. The RF from all halocarbons (0.36 W m–2) is very similar to the value in AR4, with a reduced RF from chlorofluorocarbons (CFCs) but increases from many of their substitutes. Four of the halocarbons (trichlorofluoromethane (CFC-11), CFC-12, trichlorotrifluoroethane(CFC-113) and chlorodifluoromethane (HCFC-22)) account for around 85% of the total halocarbon RF. The first three of these compounds have declining RF over the last 5 years but their combined decrease is compensated for by the increased RF from HCFC-22. Since AR4, the RF from all HFCs has nearly doubled but still only amounts to 0.02 W m–2. There is high confidence4 that the overall growth rate in RF from all WMGHG is smaller over the last decade than in the 1970s and 1980s owing to a reduced rate of increase in the combined non-CO2RF. {8.3.2; Figure 8.6}

Is 0.02 W m-2 actually small? I suppose so, since I recall that the value is well over 1000 W m-2 out in space at Earth orbital distance.

But seriously, someone who knows this stuff better than I do can put this into a proper quantitative frame, rather than the narrative frame of generalized hand-wringing. — MaxEnt 15:21, 28 June 2021 (UTC)[reply]