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jeffw@lemmy.world to Climate - truthful information about climate, related activism and politics.@slrpnk.net · 9 months ago

Climate scientists flummoxed by unexpected bump in global temperatures

www.motherjones.com

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Climate scientists flummoxed by unexpected bump in global temperatures

www.motherjones.com

jeffw@lemmy.world to Climate - truthful information about climate, related activism and politics.@slrpnk.net · 9 months ago
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“We should have better answers by now.”
  • mindlesscrollyparrot@discuss.tchncs.de
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    9 months ago

    Have they?

    “In this case, their very specific prediction was that warming of between 1.5°C and 4.5°C would accompany a doubling of atmospheric CO₂” https://theconversation.com/40-years-ago-scientists-predicted-climate-change-and-hey-they-were-right-120502

    Isn’t the problem more that people have been reading that and assuming that it means 3°, not ‘possibly 4.5°’ ?

    That said, the study there seems to assume that the effects are roughly linear, ie. that there are no tipping points.

    • NoiseColor@startrek.website
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      9 months ago

      I don’t want to go into specific predictions because there are too many. But generally, scientists are very conservative with their predictions, because they don’t want to lose grants. It’s safe to hide behind numbers and give low estimates.

      • mindlesscrollyparrot@discuss.tchncs.de
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        9 months ago

        I hear what you’re saying, but I think the real problem is the policy makers, who are without doubt choosing to use the least scary predictions, and pushing even those targets back when they fail to achieve them.

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Discussion of climate, how it is changing, activism around that, the politics, and the energy systems change we need in order to stabilize things.

As a starting point, the burning of fossil fuels, and to a lesser extent deforestation and release of methane are responsible for the warming in recent decades: Graph of temperature as observed with significant warming, and simulated without added greenhouse gases and other anthropogentic changes, which shows no significant warming

How much each change to the atmosphere has warmed the world: IPCC AR6 Figure 2 - Thee bar charts: first chart: how much each gas has warmed the world.  About 1C of total warming.  Second chart:  about 1.5C of total warming from well-mixed greenhouse gases, offset by 0.4C of cooling from aerosols and negligible influence from changes to solar output, volcanoes, and internal variability.  Third chart: about 1.25C of warming from CO2, 0.5C from methane, and a bunch more in small quantities from other gases.  About 0.5C of cooling with large error bars from SO2.

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