this post was submitted on 13 Jan 2024
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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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We’re over-freezing our food. Turning up the temperature slightly could avoid 17 Mt of CO2 (www.anthropocenemagazine.org)
submitted 11 months ago* (last edited 11 months ago) by [email protected] to c/[email protected]
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“This temperature corresponds to 0 degrees Fahrenheit, so it was “probably a round, easy number to remember”

That’s what Allouche and team will be working on next, as they build their research summary into a full report, to be published in September 2024. “These findings give good reasons for ‘3 degrees of change’ to be further explored,” Allouche says.

Three Degrees Of Change: Frozen food in a Resilient and Sustainable Food System (PDF)

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[–] [email protected] 2 points 11 months ago (1 children)

The freezer has a far simpler ready-made solution, an Acurite or Lacrosse outdoor sensor ($10-20), an RTLSDR dongle ($10) and rtl_433 to put the data on MQTT.

I do my data logging with the free version of Mango Automation SCADA which integrates very well with MQTT and is lightweight and cross platform.

Got a sensor in each of my freezers and my root cellar, rtl_433 also picks up my weather station and rain gauge, wireless buttons, motion sensors and more, rtl_433 is a great addition to any home automation system and cheap and easy to set up.

[–] grue 1 points 11 months ago (1 children)

Yes, that would be better for people who weren't already doing what I'm doing.

Oddly enough, I've actually also got a RTLSDR dongle lying around. The only thing I don't have is an outdoor temperature sensor, but instead of getting one I'll stick with my current plan and save a weather station and/or permanent/continuous freezer monitoring for a future project.

[–] [email protected] 2 points 11 months ago

Yup, I was suggesting it as an additional option where you can leave your heatermeter permanently installed on your smoker, and also monitor your freezer with minimal effort. Running rtl_433 is like a 5 minute project, and even an original Pi can run it with cycles to spare.

FWIW I found the best way to improve freezer energy performance is to drop your ambient temperature. This improves the COP and cuts cycle time more dramatically than changing the cold side setpoint (assuming you don't have the freezer really cranked to near the limits of the compressor).

My freezer is in the coldest part of my house, mostly by coincidence as that's the part nobody really lives in, with the laundry and such. It's zoned off to mostly just be kept above freezing by passive heat.