this post was submitted on 16 Apr 2024
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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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Beef produces 85 kg CO2e per kg of food. Tofu produces 2.9 kg CO2e per kg of food. (ourworldindata.org)
submitted 6 months ago by [email protected] to c/[email protected]
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[–] [email protected] 1 points 6 months ago* (last edited 6 months ago)

Right, but they didn't do that. It's a meta-analysis, so they took the value that each study got for a given crop in a specific country and then weighted all of the values by the share of global production that that country is responsible for. So if we pretend that the only three countries are Estonia, Latvia, and Lithuania, they did the following:

  • Found three studies from Estonia, two from Latvia, and two from Lithuania
  • Averaged the values of the three Estonian studies
  • Did the same for the two Latvian ones and the two Lithuanian ones
  • Found that Estonia is responsible for 60% of the world's beef, Latvia 25%, and Lithuania 15%
  • Took their three national averages and weighted them 0.6 for Estonia, 0.25 for Latvia, and 0.15 for Lithuania to get the final value for beef
  • Repeat for each other crop

The dataset was 1530 studies across 39,000 farms in 119 countries