First Principle Land Requirements to Feed a Person - Revision history

Marcin at 12:43, 30 June 2016

2016-06-30T12:43:29Z

← Older revision		Revision as of 12:43, 30 June 2016
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	A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Duckweed captures thus 10W per square meter. Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Duckweed captures thus 10W per square meter. Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

	If duckweed gets 10W per meter squared capture - we need 10 sq m or 1/400 acre. Very promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/400 of an acre is sufficient to feed a vegetarian on first principle calculations - just for the carbohydrate. That is ~~1000~~ square feet!		If duckweed gets 10W per meter squared capture - we need 10 sq m or 1/400 acre. Very promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/400 of an acre is sufficient to feed a vegetarian on first principle calculations - just for the carbohydrate. That is 100 square feet!

	Now fish are in principle very efficient converters of feed to ~~ody~~ mass - so if that factor of loss is 50% at best, then the pescaterian requires 20 sq meters of land to feed them¡!!!!!!!!!		Now fish are in principle very efficient converters of feed to body mass - so if that factor of loss is 50% at best, then the pescaterian requires 20 sq meters of land to feed them¡!!!!!!!!!

	Doomsday? I don't think so.		Doomsday? I don't think so.

Marcin at 12:41, 30 June 2016

2016-06-30T12:41:40Z

← Older revision		Revision as of 12:41, 30 June 2016
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	A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Duckweed captures thus 10W per square meter. Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

	So we ~~stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters,~~ or 1/4 acre. ~~Not so~~ promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed a vegetarian on first principle calculations. That is 1000 square feet!		If duckweed gets 10W per meter squared capture - we need 10 sq m or 1/400 acre. Very promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/400 of an acre is sufficient to feed a vegetarian on first principle calculations - just for the carbohydrate. That is 1000 square feet!

	Now fish are in principle very efficient converters of feed to ody mass - so if that factor of loss is 50% at best, then the pescaterian requires ~~200~~ sq meters of land to feed ~~them~~.		Now fish are in principle very efficient converters of feed to ody mass - so if that factor of loss is 50% at best, then the pescaterian requires 20 sq meters of land to feed them¡!!!!!!!!!

			Doomsday? I don't think so.

Marcin at 10:36, 30 June 2016

2016-06-30T10:36:33Z

← Older revision		Revision as of 10:36, 30 June 2016
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	A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

	So we stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters, or 1/4 acre. Not so promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed a vegetarian on first principle calculations.		So we stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters, or 1/4 acre. Not so promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed a vegetarian on first principle calculations. That is 1000 square feet!

			Now fish are in principle very efficient converters of feed to ody mass - so if that factor of loss is 50% at best, then the pescaterian requires 200 sq meters of land to feed them.

Marcin at 10:33, 30 June 2016

2016-06-30T10:33:25Z

← Older revision		Revision as of 10:33, 30 June 2016
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	A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

	So we stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters, or 1/4 acre. Not so promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed vegetarian on first principle calculations.		So we stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters, or 1/4 acre. Not so promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed a vegetarian on first principle calculations.

Marcin at 10:32, 30 June 2016

2016-06-30T10:32:54Z

← Older revision		Revision as of 10:32, 30 June 2016
Line 1:		Line 1:
	A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

			So we stand at a factor of 1000 for human energy requirement from that coming in from the sun. So 1000 square meters, or 1/4 acre. Not so promising. The fish there are a trophic chain loss, so if we have another crop that produces at 1% - then 1/40 of an acre is sufficient to feed vegetarian on first principle calculations.

Marcin at 10:29, 30 June 2016

2016-06-30T10:29:17Z

← Older revision		Revision as of 10:29, 30 June 2016
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	A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.		A person uses 100w of energy from food. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

Marcin at 10:27, 30 June 2016

2016-06-30T10:27:37Z

← Older revision		Revision as of 10:27, 30 June 2016
Line 1:		Line 1:
	A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W, and plants such as duckweed convert .1%. ~~then you need 200 sq meters if you~~ eat duckweed ~~through tilapia~~.		A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W per sq meter, and plants such as duckweed convert 1% (chemical), or about 10x less than PV panels (electric). Tilapia eat duckweed, so that gets energy down to .1% conversion efficiency at conservative estimates.

Marcin at 10:20, 30 June 2016

2016-06-30T10:20:07Z

← Older revision		Revision as of 10:20, 30 June 2016
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	A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]		A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]. The sun shines 1000W, and plants such as duckweed convert .1%. then you need 200 sq meters if you eat duckweed through tilapia.

Marcin at 10:17, 30 June 2016

2016-06-30T10:17:59Z

← Older revision		Revision as of 10:17, 30 June 2016
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	A person uses 100w of energy.		A person uses 100w of energy. [http://sustainability.blogs.brynmawr.edu/2012/07/31/understanding-energy-part-1/]

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2016-06-30T10:14:14Z

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