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1answer
356 views

Material For Heat Riser

I'm in the process of building my first Rocket Stove, that will give me highly sustainable energy (if one considers burning wood to be sustainable). For the heat riser I'm looking for heat resistant ...
4
votes
3answers
172 views

Why is there so much scarcity of water?

Today I heard on the radio that only 1 litre of water will be available per person by year 2090. If there is plenty of seawater present on our earth and there are processes like desalination and ...
4
votes
2answers
184 views

Most sustainable type of cream container?

The grocery co-op where I shop offers local, organic cream from three different farms, which use three different types of recyclable containers (all roughly the same volume): Mini version of clear ...
3
votes
1answer
167 views

Rocket Mass Heater Build

I'm getting ready to build my first rocket mass heater. I have access to free quartz stone and granite. Could I use this type of material to build my "J Tube" instead of fire brick? Not really sure if ...
3
votes
3answers
972 views

Is 3 phase electrical generation more efficient to utilize than single phase?

Is 3 phase power more efficient to generate/use? How difficult or complicated is it going to be to provide balanced single phase load(s) from a 3 phase service? (equipment & controls required) If ...
3
votes
0answers
62 views

Is burning PVC with municipal waste 'acceptable' nowadays?

I started to write a comment under the question Is there an efficient way to dispose of credit cards? about the dangers of burning PVC, because this can lead to dangerous chlorine compounds in the ...
3
votes
3answers
91 views

Does Start / Stop technology in cars have an impact on air quality and by how much?

I have repeatedly heard from various car enthusiasts that start stop technology has no benefit in improving air quality (or the tiniest smallest negligble benefit). Does it have an effect and how much?...
3
votes
1answer
87 views

Is there an efficient way to dispose of credit cards?

I have about 10 credit cards which I ended up not using for various reasons and I feel bad for having to throw them away in the trash, this is the case for many other things, but seems quite ...
3
votes
2answers
119 views

How do I get rid of numerous small pieces of charcoal?

There's a small piece of land used for burning tree branches on bonfire (because that's the easiest way to get rid of them). Most of the material gets burnt to ashes but some of it only turns into ...
3
votes
1answer
1k views

What are crisp packets made from?

What are crisp packets made from, specifically Tyrrells or Walkers. I am doing a school project on single use plastic crisp packets. I am finding it difficult to find information online.
3
votes
1answer
100 views

Which is best for dealing with food waste — composting or a biogas digester?

Let's say I have the option to send my food scraps to either a composting site, or a biogas digester. Both are industrial scale, following best practices. The output from each is high quality and ...
2
votes
1answer
299 views

How long will a 12V Koolatron compact cooler last with 12Ah battery?

I'm thinking of purchasing a Koolatron P20 compact cooler and this ExpertPower 12200 battery How long will cooler last with this battery at full charge? Is this the correct battery to use for this? ...
2
votes
2answers
88 views

Are there any unsustainable supply-chain issues unique to hydrogen fuel cell vehicles?

I was recently reading that lithium mining for electric vehicle batteries is wreaking havoc on deserts in Chile. One proposed alternative to EVs in the search for a replacement for petroleum-fueled ...
2
votes
0answers
30 views

For the exactly same income, does a person pollutes more when living in a big city or in a small town? [duplicate]

I had a recent argument with a coworker (we are both engineers) that the amount of pollution (trash+water+air) generated by a person increases with the person's income (we both agreed on that) but my ...
2
votes
1answer
29 views

How does the EPA estimate annual power consumption for refrigerators?

I'm trying to get a simplified idea of how the EPA estimates annual power consumption for refrigerators, e.g. here. There are a number of reasons why I want to know this, but there are three big ones: ...
2
votes
2answers
93 views

How to reduce energy usage of refrigerator while away?

I'm getting ready to take a trip for about a month. We'll eat all of the perishable stuff in our fridge/freezer, but this will leave lots of other things that will do just fine (frozen veggies, ...
2
votes
1answer
60 views

Can furnace condensate water be used for houseplants?

I recently had my old, broken furnace replaced with a high-efficiency condensing furnace. One function of this furnace is that it extracts enough heat from the exhaust gases to condense them into ...
1
vote
2answers
265 views

What type of guinea pigs will keep a food forest well cleaned?

I'm building a food forest, and was wondering what type of guinea pigs would work best to keep a food forest floor clean while not harming my plants so I can have plenty of food as well as getting ...
1
vote
1answer
235 views

Does a PV panel take more energy to build than it generates in its lifetime? [duplicate]

Industrial energy costs are $1 per million BTU (MMBTU) or 300kWh, or $3*10^-6 per watt hour (Wh). http://www.eia.gov/consumption/manufacturing/ Solar has 1 kg of 9n silicon per 100W, at $20/kg. ...
1
vote
1answer
46 views

How is amount of wood measured?

There has been some confusion here related to measurement of amounts of wood. There are at least the following units of wood measurement: loose cubic meter of wood stack cubic meter of wood solid ...
0
votes
1answer
81 views

How do I innoculate a 3 year old tree with a mycorrhizal fungus? [closed]

I have a number of fruit trees that have been in the ground for several years. I did not have access to mycorrhizal innoculants at the time of planting. Can I inoculate them somehow now? How?
-1
votes
1answer
178 views

What can an individual contribute to the fight against global warming? [closed]

It's been so drastic - changes in environment all over the world. What can an individual contribute to fight against global warming? If it continues this way, the world as we know it won't exist ...

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