this post was submitted on 31 Jul 2023
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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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America Needs To Install A Lot More Heat Pumps (www.distilled.earth)
submitted 1 year ago* (last edited 1 year ago) by [email protected] to c/[email protected]
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I'll note that this post is paywalled, but the key facts are outside the paywall.

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[โ€“] [email protected] 2 points 1 year ago (1 children)

It's a really bad piece of jargon, but is an internally consistent definition. They mean (heat entering building)/(work consumed) > 1

Which is a way if defining efficiency (energy out / energy in), just a really awful and misleading one.

In terms of % of carnot efficiency, the best heat pumps are about where stationary heat engines generally are, 40% or so.

[โ€“] [email protected] 2 points 1 year ago

Thank you! It seems to me to be like saying "LEDs are more than 100% efficient because we're applying the same metric of efficiency that we would for incandescent bulbs". They're two different methods of generating heat, why would you use the efficiency rule from one to judge the other?