Talk:Environmental Impact: Difference between revisions
Jump to navigation
Jump to search
No edit summary |
(Clarify rationale, add signature to my first entry. Respond to food vs. education with quote from Dr. Negroponte.) |
||
| Line 1: | Line 1: | ||
If the laptop battery is recharged using muscle power, it will impact the food a child needs. A simple conversion assuming a 90% efficient charging cycle and 15% efficient [http://en.wikipedia.org/wiki/Food_energy human food to muscle power conversion] results in 105-140 calories of food required for each laptop recharge. Extra [http://www.popsci.com/popsci/science/61994314e58fb010vgnvcm1000004eecbccdrcrd.html calories used due to thinking more] aren't included! |
Does it make sense to add discussion of food and/or recharge facilities to [[Environmental Impact]]? If the laptop battery is recharged using muscle power, it will also impact the food a child needs. A simple conversion assuming a 90% efficient charging cycle and 15% efficient [http://en.wikipedia.org/wiki/Food_energy human food to muscle power conversion] results in 105-140 calories of food required for each laptop recharge. Extra [http://www.popsci.com/popsci/science/61994314e58fb010vgnvcm1000004eecbccdrcrd.html calories used due to thinking more] aren't included! --MWarren 20:15, 5 December 2007 (EST) |
||
{|border="1" cellpadding="5" cellspacing="0" |
{|border="1" cellpadding="5" cellspacing="0" |
||
| Line 8: | Line 8: | ||
|cal || 14187.4 ||18916.6 |
|cal || 14187.4 ||18916.6 |
||
|-align="right" |
|-align="right" |
||
|kcal (aka food |
|kcal (aka food Calories) || 14.2 || 18.9 |
||
|-align="right" |
|-align="right" |
||
| |
|charge cycle efficiency 90% || 15.8 || 21.0 |
||
|-align="right" |
|-align="right" |
||
|[http://en.wikipedia.org/wiki/Food_energy human food to muscle work conversion efficiency] 15% || '''105.1''' || '''140.1''' |
|[http://en.wikipedia.org/wiki/Food_energy human food to muscle work conversion efficiency] 15% || '''105.1''' || '''140.1''' |
||
| Line 18: | Line 18: | ||
::Also, even in the 3rd world, a majority of children have some play room between the calories they consume and the physical work they are expected to do. If they don't, a laptop is really not what they need anyway, and probably not what anybody would give them, to boot. [[User:Homunq|Homunq]] 22:01, 5 December 2007 (EST) |
::Also, even in the 3rd world, a majority of children have some play room between the calories they consume and the physical work they are expected to do. If they don't, a laptop is really not what they need anyway, and probably not what anybody would give them, to boot. [[User:Homunq|Homunq]] 22:01, 5 December 2007 (EST) |
||
::: Hopefully the children do have some extra play room; the issue of food and/or recharge facilities seemed like another good topic for this page. Here is how [http://www.olpctalks.com/nicholas_negroponte/ Dr. Negroponte] responded to the laptop vs. food question in an [http://www.olpctalks.com/nicholas_negroponte/nicholas_negroponte_1.html OLPC Analyst Meeting]: |
|||
:::"... And the second part of your question is that very often, this appears in the press all the time, we get a question of this sort ..I mean I'm just going to illustrate it: "Why give laptops to kids who are dying of hunger, malaria, who don't have clean water?" |
|||
:::The answer to that question is very simple, just substitute the word "education" for "laptop" and you'll never say it again. Because, clearly, if a child is dying of hunger that child needs food right then and there. Education is not on .. it's a separate thing. |
|||
:::But when you solve and you address and you work on all of those problems nobody I know would say: "By the way, let's hold off on education." The reason you don't do that is because education happens to be a solution to all of those same problems." --[http://www.olpctalks.com/nicholas_negroponte/ Nicholas Negroponte] |
|||
:::--[[User:Mwarren|Mwarren]] 13:28, 6 December 2007 (EST) |
|||
Revision as of 18:28, 6 December 2007
Does it make sense to add discussion of food and/or recharge facilities to Environmental Impact? If the laptop battery is recharged using muscle power, it will also impact the food a child needs. A simple conversion assuming a 90% efficient charging cycle and 15% efficient human food to muscle power conversion results in 105-140 calories of food required for each laptop recharge. Extra calories used due to thinking more aren't included! --MWarren 20:15, 5 December 2007 (EST)
| NiMH | LiFePO4 | |
|---|---|---|
| Wh | 16.5 | 22.0 |
| cal | 14187.4 | 18916.6 |
| kcal (aka food Calories) | 14.2 | 18.9 |
| charge cycle efficiency 90% | 15.8 | 21.0 |
| human food to muscle work conversion efficiency 15% | 105.1 | 140.1 |
- One of the reasons why the solar option is so appealing. --Walter 21:11, 5 December 2007 (EST)
- Also, even in the 3rd world, a majority of children have some play room between the calories they consume and the physical work they are expected to do. If they don't, a laptop is really not what they need anyway, and probably not what anybody would give them, to boot. Homunq 22:01, 5 December 2007 (EST)
- Hopefully the children do have some extra play room; the issue of food and/or recharge facilities seemed like another good topic for this page. Here is how Dr. Negroponte responded to the laptop vs. food question in an OLPC Analyst Meeting:
- "... And the second part of your question is that very often, this appears in the press all the time, we get a question of this sort ..I mean I'm just going to illustrate it: "Why give laptops to kids who are dying of hunger, malaria, who don't have clean water?"
- The answer to that question is very simple, just substitute the word "education" for "laptop" and you'll never say it again. Because, clearly, if a child is dying of hunger that child needs food right then and there. Education is not on .. it's a separate thing.
- But when you solve and you address and you work on all of those problems nobody I know would say: "By the way, let's hold off on education." The reason you don't do that is because education happens to be a solution to all of those same problems." --Nicholas Negroponte
- --Mwarren 13:28, 6 December 2007 (EST)