User contributions for Elie

For Elie talk block log uploads logs
A user with 1,953 edits. Account created on 18 May 2022.
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29 August 2022

  • 18:1818:18, 29 August 2022 diff hist +163‎ N Talk:Land/built-up ‎ Created page with "==To do== Compare results to official estimates. Generate an image from the tester code. ~~~~"
  • 18:1618:16, 29 August 2022 diff hist +2,456‎ N Land/built-up ‎ Created page with " ==Using 'population' data to estimate built-up land== Some inner cities can be quite dense, but even the less-dense suburbs are still fully ''built-up'', as none of the land is truly ''wilderness'' {{x|even the parks and nature trails are heavily touched by humans}}, and none of it is considered farm land {{x|maybe this could change with suburban farming, but even then, maybe double-counting the same land (as ''both'' cropland ''and'' built-up land) is ok}}. Let's est..."

27 August 2022

26 August 2022

25 August 2022

  • 10:4810:48, 25 August 2022 diff hist +4,269‎ N Code:fao2usda.csv ‎ Created page with "This is part 2 of the fao_usda.csv cross-reference table. This one deals with animal products instead of plant products. ==Code== <syntaxhighlight lang="csv"> "Item Code (FAO)","NDB_No","Multiplier" 1062,01123,1 1091,01138,1 1182,19296,1 1166,80200,1 1108,17152,1 1089,05144,1 947,17160,1 1127,17172,1 867,13047,1 1058,05001,1 1069,05139,1 1163,17330,1 1017,17168,1 1073,05146,1 1097,17170,1 1111,17144,1 1158,17158,1 1151,17..."
  • 10:3610:36, 25 August 2022 diff hist +15,148‎ N Code:fao usda.csv ‎ Created page with "fao_usda.csv is a cross-reference table, to connect data from two sources: # FAO Primary Crop Production # USDA Nutrition Data, SR Legacy Purpose: to help analyze crop production in terms of calories, protein, etc. FAO data specifies crop production in tonnes, but for some crops, this includes some inedible parts. For example a ton of bananas includes the peels; a ton of apples includes the co..."
  • 10:2910:29, 25 August 2022 diff hist +70,968‎ Code:food1.sql ‎No edit summary
  • 09:5709:57, 25 August 2022 diff hist +847‎ N Analysis ‎ Created page with "Unlike Wikipedia, ''this'' wiki is full of ''original research''. We aim to make analysis as open, transparent, and repeatable as possible. You can help analyze data - here's our standard way to set up a folder on your computer: * Any files from the <code>Code:</code> namespace should be saved in the root of the folder. * Any files from the <code>File:</code> namespace should be saved in a subfolder called <code>data/</code>. ** Files that are Term:primary data from..."
  • 09:5509:55, 25 August 2022 diff hist +115‎ Code:food2.sql ‎No edit summary
  • 09:2509:25, 25 August 2022 diff hist +2,152‎ N Code:food2.sql ‎ Created page with "Like Code:food1.sql, this analyzes food production data from FAO, and nutrition data from USDA. But while ''food1'' is focused on plants (crops Term:primary), ''food2'' is focused on animal products (livestock primary). <syntaxhighlight lang="sql"> -- Analysis of the production of animal products -- Load data from various sources .mode csv -- cross-reference table 2: livestock products (FAO data) with foods (USDA nutrition data): .import fao2usda.csv..."
  • 08:2308:23, 25 August 2022 diff hist +4,399‎ File:food-funnel.png ‎No edit summary

24 August 2022

15 August 2022

14 August 2022

13 August 2022

9 August 2022

  • 02:1802:18, 9 August 2022 diff hist −54‎ Responses ‎ →‎Energy-related current
  • 02:0202:02, 9 August 2022 diff hist +160‎ Ammonia ‎No edit summary current
  • 01:5101:51, 9 August 2022 diff hist +3,705‎ N Responses ‎ Created page with "==Energy-related== ===Response to=== Du, HL., Chatti, M., Hodgetts, R.Y. et al. Electroreduction of nitrogen at almost 100% current-to-ammonia efficiency. Nature (2022). https://doi.org/10.1038/s41586-022-05108-y https://www.nature.com/articles/s41586-022-05108-y This could be a breakthrough for fertilizer. Electricity could convert nitrogen gas (N<sub>2</sub>) to ammonia (NH<sub>3</sub>) at nearly 100% efficiency - unlike any previous attempts. Lithium is..."
  • 01:0201:02, 9 August 2022 diff hist +762‎ N Ammonia ‎ Created page with "Ammonia (NH<sub>3</sub>) is a form of nitrogen. The vast majority of ammonia is used for fertilizer. Ammonia production requires energy. Currently this is mainly done with fossil fuels. But suppose we find another (greener) scaleable way to produce it... Then could it also be used as the "fuel of the future"? Because apparently it's easier to work with (storage, transport, etc) than hydrogen gas. Questions unanswered: What about the..."

7 August 2022

6 August 2022

5 August 2022

  • 12:1512:15, 5 August 2022 diff hist +36,136‎ N Code:isochromic.c ‎ Created page with "<syntaxhighlight lang="c"> // Elie's isochromic image generator v0.5 // Copyright 2022, Elie Goldman Smith // License: GNU GPL V3 // To compile this code: // gcc isochromic.c -lm -lfftw3 -lreadline -lcurses -O3 -o isochromic // # takes awhile to compile, because of optimization and stb_image #include <ctype.h> #include <fftw3.h> #include <math.h> #include <signal.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <readline/readline.h> #include <..."
  • 12:1112:11, 5 August 2022 diff hist +14,170‎ N Code:food1.sql ‎ Created page with "<syntaxhighlight lang="sql"> -- This is used in the methodology of various olam.wiki pages -- Copyright Elie Goldman Smith, 2022 (Creative Commons license) -- Run this in SQLite3 ---------------------- -- Load data from various sources .mode csv -- cross-reference: crops (FAO data) with foods (USDA nutrition data): .import fao_usda.csv fao_usda -- nutrition (USDA): .import data/sr28-collated.csv..."
  • 07:3007:30, 5 August 2022 diff hist −290,389‎ Crop choices ‎ →‎Best yielding crops for each region
  • 04:4104:41, 5 August 2022 diff hist +15‎ Crop choices ‎ →‎Best yielding crops for each region

4 August 2022

23 June 2022

  • 17:4317:43, 23 June 2022 diff hist +164‎ Materials ‎ →‎Research needed current
  • 17:3817:38, 23 June 2022 diff hist +832‎ N Laundry ‎ Created page with "People like to have clean clothes. But how many resources does it take to uphold the "western" lifestyle of (for example) washing a shirt after wearing it no more than twice? ==Research needed== Things to consider * Soap and water involved * Energy used by the washer * Energy used in manufacturing the washer, divided by the number of washes expected of the lifespan Approaches * Calculate things per wash, or per clothing item washed * Scale it up and see if it matches ot..." current
  • 17:3517:35, 23 June 2022 diff hist +873‎ N Cars ‎ Created page with "==Research needed== Vehicles to analyze * Electric car(s) * Gasoline-powered car(s) For each vehicle * Life cycle assessment: stages ** production (materials, manufacturing) ** usage (driving, repairs, maintenance) ** disposal (scrapping, recycling, and/or putting in landfill) * For each stage, list resources used: ** Energy ** Materials (start by quantifying each material separately, if possible) ** If data is available: *** Carbon emissions *** Other pollution *** Labo..." current
  • 17:2517:25, 23 June 2022 diff hist +1,599‎ N Appliances ‎ Created page with "It's a common ''green initiative'' to replace '''old''' appliances with '''new''' ones that use less energy. But in what cases is this actually beneficial to the environment - and in what cases is it '''worse'''? We have to compare the environmental footprint of making a new appliance vs the energy saved. Reasons we shouldn't assume (by default) that replacement is the better choice: * Globally, Energy#Energy_demand|manufacturing uses far more energy than house..."

22 June 2022

  • 23:5323:53, 22 June 2022 diff hist −7‎ Wood ‎No edit summary current
  • 23:5223:52, 22 June 2022 diff hist +927‎ N Wood ‎ Created page with "/wood Wood is both a material and a fuel. It comes from cutting down trees. ==Research needed== Global production of wood * By source type ** Tree farms *** Yields: how much wood per day per acre? ** Old growth *** How much wood per acre of deforestation? * By product grade ** Lumber ** Firewood ** Pulp/paper ** Sawdust ** Other? What would happen if global production increased? More old-growth forests would be converted to tree farms, I wo..."
  • 19:4719:47, 22 June 2022 diff hist +479‎ N Talk:Materials ‎ Created page with "==How to make this work?== What should I (the webmaster) put in place to enable people to easily contribute to the research? I'm trying to set it up in a way that... * anyone can contribute information on any material (glass, steel, etc) * the information fits into the framework I wrote (environmental impacts) Should there be some sort of a workspace? Perhaps a wiki table or two? I'm looking for ideas. ~~~~" current
  • 19:2619:26, 22 June 2022 diff hist +964‎ N Materials ‎ Created page with "The world depends on materials such as metal, glass, plastic, wood, and so many more. All of these have an environmental impact, and involve some human labor. How do we weigh the benefits of any ''green solution'' against the materials it uses? ==Research needed== For each material, consider * The energy it takes to produce it * The pollution it takes to produce it {{x|If there are less polluting ways, are there tradeoffs such as needing mo..."
  • 19:0719:07, 22 June 2022 diff hist +863‎ N Insulation ‎ Created page with "It takes energy to heat & cool buildings. The worse the insulation, the more energy it takes. There are plenty of ways to improve the insulation. But that ''also'' takes energy - as well as labor and materials. We need to compare the environmental impact of ''doing the work'' vs ''doing nothing''. In which cases is it better to renovate, and in which cases is it better to just let it be? ==Research needed== Compare various retrofit scenarios, such as * Replacing o..." current

8 June 2022

31 May 2022

30 May 2022

29 May 2022

28 May 2022

27 May 2022

25 May 2022

  • 04:3004:30, 25 May 2022 diff hist +157‎ Talk:Surplus electricity ‎ →‎Amounts current
  • 04:1804:18, 25 May 2022 diff hist +330‎ N Talk:Surplus electricity ‎ Created page with "==Amounts== It would be good to quantify surplus electricity. Some salient stats: hydro power stations only use 36% of their capacity on average. {{ecalc|hydropower.consumption|% hydropower.capacity}} Might be useful to generate an Term:isochromic world map of all surplus electricity, superimposed with population."
  • 04:1604:16, 25 May 2022 diff hist +1,117‎ N Surplus electricity ‎ Created page with "At every moment in time, electricity generation has to be carefully balanced against electricity consumption. Renewables can sometimes generate too much electricity that has nowhere to go. File:electricity-supply-demand-curves.png ==Sources== ===Solar=== If rooftop solar panels were commonplace, there would be surplus electricity during the day. ===Wind=== In some cases, there is surplus electricity during peak winds. ===Hydro=== Even though hydropower capacity..." current
  • 03:3203:32, 25 May 2022 diff hist +1,377‎ N Hydrogen gas ‎ Created page with "Hydrogen gas (H2) is a fuel that when burned, produces no pollution and no carbon emissions - only water vapor (H2O). Just one problem: There are '''no''' natural resources of hydrogen gas. To make hydrogen gas, you need to use some other energy source. ==Production== ===Electrolysis=== Electricity can turn water (H2O) into hydrogen gas (H2) and oxygen gas (O2). The electricity could come from renewable sources such as solar, wind, or..."
  • 03:1803:18, 25 May 2022 diff hist +800‎ N Talk:Hydrogen gas ‎ Created page with "==Green hydrogen from fossil fuels?== Is it thermodynamically possible to ''extract'' the hydrogen from fossil fuel molecules while leaving behind solid carbon (not oxidized to CO2)? Example chemical formula: CH4 -> 2 H2 + C<br /> Of course this is only worthwhile if it takes less energy than you would get from burning the H2 later. If it is viable, maybe we could get all our energy from fossil fuels and just "burn the hydrogen, not the carbon"? I have read about so-c..."
  • 00:4200:42, 25 May 2022 diff hist +201‎ N Talk:Energy storage ‎ Created page with "==Format== Should it have a table of 'storage type' and 'limitations', kinda like the energy page ("limits to energy sources")? ~~~~" current

24 May 2022

22 May 2022

21 May 2022

19 May 2022

18 May 2022

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