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4
votes
2answers
91 views

How to use a band brake cable with my home built wind turbine?

I recently bought a band brake for a home built wind turbine and was thinking of mounting it on the shaft and getting a cable from the brake to the ground so I can stop the blades in case of ...
2
votes
0answers
29 views

Hyper carbon accumulator(s) for backyards

I am curious, what people could do with a small piece of land like their home backyard (say originally it is a regular lawn smaller than 20m^2, in temperate continental climate (so pretty harsh)) to ...
2
votes
2answers
44 views

Can I recycle greasy metal in the US?

In the United States, I know that paper and plastic are often not recyclable if they are greasy. Can I recycle metal that has vegetable grease on it surface? I'm thinking of canisters that once ...
3
votes
1answer
64 views

My residential colony burns dry grass every year; how can I stop them?

Every year during June-October, it rains and a few months later after the rainy season there is a lot of grass growing in the empty sites in my residential colony. So all the grass is cut, piled up ...
6
votes
2answers
94 views

How do I dispose trash without using plastic bags?

Everyday, we dispose of our trash using plastic bags. This prevents the trash (especially liquids) from leaking out and contaminating our garbage disposal systems. Obviously, things such as paper bags ...
6
votes
1answer
50 views

How do German fossil fuel subsidies compare to PV subsidies?

Over on Politics.SE there's an interesting discussion about "grid parity": "If grid parity has already been reached, why is it so expensive to switch to renewable energy?". The discussion has ...
4
votes
1answer
84 views

Are trains more sustainable than electric buses?

I assume the energy for electric buses and trains comes from the same sources. But a train doesn't need to carry it's power supply along, contrary to a bus. However, there is more infrastructure that ...
27
votes
7answers
9k views

Why am I offered a 5 kW inverter with a 6.6 kW solar installation?

I've just received two quotes for installing a rooftop solar system at my residential address (near Sydney, Australia). This caught my eye: Company 1: Panel: 22 x ET panels 300w Inverter: Growatt 5 ...
2
votes
1answer
42 views

Can cost be used as a useful measure of a product's sustainability?

What are the gotchas in comparing the prices of similar objects to determine sustainability?
4
votes
1answer
122 views

Can residential rooftop solar arrays be cheaply extended over time?

I am looking to install rooftop solar on my house some time this year. I have a decent amount of roof space and very little shading so I should achieve fairly ideal conditions for it. A lot of the ...
3
votes
4answers
84 views

Are oil and natural gas inherently linked?

I've heard a lot of people push for natural gas as a fuel for generating electrical power. However, oil is said to be a very dirty fuel. Aren't oil and natural gas harvested from the same sources? The ...
2
votes
0answers
27 views

What is the carbon footprint of pet food?

Are there any detailed studies of the carbon footprint of pet food production? There are plenty of articles asserting that meat in cat and dog food is a major source of carbon emissions (e.g. from ...
2
votes
0answers
15 views

What are the most common sources of VOC pollution in outdoor air?

I have a personal pollution monitor that has been recording higher levels of VOCs the last 18 hours or so and I'm trying to understand and consider the reasons for this. I live in a fairly busy city (...
3
votes
1answer
39 views

How many grams of CO2 are emitted to produce one paper napkin?

Does using paper napkins have a high carbon impact?
2
votes
1answer
68 views

Is it ok to mix battery brands in a solar battery bank?

I plan on installing 12V 100 Ah LiFePO4 batteries, but since they are so expensive, I might buy from different vendors. The batteries have the same chemistry, voltage, and amperage, but are from ...
3
votes
0answers
21 views

What is the time basis for offset programs?

I'm kicking around the idea of creating a local offset program. My question is: what is the time basis for offsets? Best seen with an example. Say I build a solar PV system that costs $10,000 and ...
5
votes
1answer
34 views

Biomass: Digestor/Reactor vs Gasifier Efficiency

When using biomass for energy, two popular options are reactors and gasifiers. The first uses anaerobic micro organisms to convert the biomass to fertilizer and a methane rich gas mixture. The second ...
4
votes
2answers
47 views

Is global population growth ignored in sustainable energy discussions because it makes any effort seem futile?

We (I'm in EU, Netherlands) are trying to reduce CO2 emissions, and many other regulations (nitrogen, pfas) have been devised to make sure we don't make our planet uninhabitable for humans. But I don'...
5
votes
2answers
74 views

Are composting toilets better than septic systems?

As a sustainability advocate I've always assumed that composting toilets were "better" than septic systems in almost any application. However I've been reading up a bit on both system types (see ...
6
votes
3answers
121 views

How to reduce evaporation of a dam/catchment water source?

My city has a catchment area for water but due to drought conditions it's getting lower and lower in current capacity, and water restrictions have been placed into effect for residents and businesses ...
6
votes
2answers
115 views

How much of a reduction of carbon emissions can be achieved if a diesel bus is switched out for electric?

My city council has pledged to try and be carbon neutral by 2030 as part of the Global Covenant of Mayors and are investigating ways to achieve that. I'd like to bring forth an idea to replace our ...
5
votes
1answer
76 views

Single-use wooden vs plastic cutlery

I just joined a waste minimization board in my office and one of the area we discussed was the use of plastic cutlery in our canteen. While the best option in my opinion would be to remove all single ...
2
votes
2answers
93 views

What are the impacts on CO2 emissions from using cloud software?

I am wondering what are the positive as well as negative impacts on CO2 emissions from using cloud software like Google Sheets, in comparison to traditional software that run locally or on a local ...
4
votes
0answers
53 views

How much CO2 is currently captured in the EU per year with CCS technologies?

I wonder how much carbon dioxide is captured per annum in the EU at the moment. In this article (p. 5), one can read that the two largest CCS facilities in Europe currently capture around 1,55 Mt/y. ...
5
votes
1answer
78 views

Is charging Tesla Model 3 at 110v/15amp less energy efficient than at 220v/30amp?

I have a rudimentary understanding of volts and amps. (Volts is like pressure and Amps are like the bandwidth of that pressure.) So just reasoning about it, I imagine charging to be an event where the ...
3
votes
1answer
45 views

Why is there no energy star certification for portable or box fans?

Why are there no energy star certifications for portable fans? From what I understand no portable electric heaters have the certification because using a portable heater is not efficient at all. ...
5
votes
2answers
74 views

What is the effect of hot weather on the performance of electric vehicles?

Allied to the question: How does cold weather affect electric vehicles? How does hot weather affect electric vehicles, particularly when the atmospheric temperature is above 30 C and closer to 40 C,...
2
votes
3answers
73 views

Will there be a role for combined heat and power in an all-electric future?

Beneficial electrification From the National Resources Defense Council “Beneficial electrification,” a new catchphrase in the energy world, refers to the growing recognition that using clean ...
6
votes
3answers
96 views

How does cold weather affect electric vehicles?

I live in Madison, Wisconsin, US where our winters are cold -- for January and February, the average low is around -10C, with extremes regularly dipping below -20C. I currently have a 20-year old car....
1
vote
0answers
22 views

Data source for real world solar PV production?

In the U.S., the National Renewable Energy Lab (NREL) provides some great resources for examining the potential of solar PV systems, such as PVWatts and the National Solar Radiation Database viewer. ...
2
votes
0answers
15 views

Is it worth buying compostable dog poop bags instead of plastic if I'm going to throw them in regular trash bins? [duplicate]

I walk my dogs twice a day, pick up their poop with small disposable bags, and throw the bags in the first municipal trash bin I come across. They will presumably end up in a landfill. I previously ...
2
votes
1answer
68 views

Rule of thumb for estimating the carbon footprint of a manufactured good

I am looking for a simple "methodology" to roughly estimate the carbon footprint associated with buying a new e.g. toaster. More precisely, I would like to have clues to deal with such a situation: ...
0
votes
0answers
32 views

Solar setup for well pump

The electricity where I live is pretty expensive at about almost 30 cents a KWh, so I'm considering setting up a solar system. I got 3 100 Watt Polycrystalline solar panels a while ago, pretty cheap. ...
3
votes
0answers
30 views

WTW versus LCA approach in carbon footprint calculations?

I recently did some carbon footprint calculations for the organization I work for. I used conversion factors I found at the Dutch CO2 emission factors website. This website lists standard emission ...
1
vote
0answers
36 views

What are the benefits or shortcomings of a moss wall?

I'm considering to put up a small moss wall in my workplace. What benefits or shortcomings should be considered regarding inhabitants' health and environment impact of a moss wall? Update: It's an ...
3
votes
3answers
117 views

Biomass plants. Why do we use them?

I've recently read they are classified as "clean energy", and some nations do not count the CO2 emissions it produces towards a national CO2 quota/limit. At this point I am a little confused. Won't ...
1
vote
2answers
43 views

How can I tell if my light is insect friendly?

This time of year, on my commute home through the forest, I need a bright headlight for me and other humans (and some wildlife) to stay safe. However, research suggests that night lights kill many ...
1
vote
0answers
32 views

How to sustainably survive in Besieged Hong Kong Polytechnic University? [closed]

Given the current situation in Hong Kong Polytechnic University, with 50 survivers (protesters) being besieged by more than 500 polices located at every intersection of streets nearby, and even drains/...
2
votes
1answer
30 views

Can data from wind and solar farms be used to improve climate modeling?

As of 2018, there were over 341,000 wind turbines around the world. In the U.S. alone, a projected one million homes will have roof-top solar PV by 2020. This does not include commercial or utility ...
4
votes
1answer
41 views

Which materials dumped into landfills are the largest sources of methane?

Recent research has shown that landfills (garbage dumps) can be major emitters of methane. The largest methane emitters in California are a subset of landfills, which exhibit persistent anomalous ...
3
votes
1answer
35 views

Should I turn vermicompost?

After adding plant matter to vermicompost, it kinda just sits there for a while, attracting fruit flies and growing mould. Would it be better to try to turn the compost so that the new matter is at ...
0
votes
2answers
51 views

In what unexpected ways could human hairs be recycled or upcycled? [duplicate]

Currently, hairdressers around the world throw away tonnes of human hairs after they have given someone a new hairstyle. I know people sometimes donate their hair, which can be used to create wigs. ...
1
vote
0answers
30 views

Must I install bypass diodes across my solar panels?

I have an array consisting of ten solar panels wired in series as shown in the figure below: My problem is that during some winter months (Oct - Dec maybe), in the afternoon, the sun is so low that ...
0
votes
1answer
55 views

Is there any case where plant farming is more eco friendly than raising livestock?

I am looking for an example or a case with arguments that would justify converting cattle ranches into plant farms (e.g., wheat, apple, or anything non-meat). The advantages should be in a more ...
1
vote
0answers
28 views

Examples of a city or region with poor economy and environmental pollution that turned to green economy and prospered

I am looking for some examples of cities or regions that initially suffered from poor economy, unemployment, pollution or any environmental problems, but they turned to green technology and ...
5
votes
4answers
67 views

How to design a taxi rank to charge electric vehicles whilst waiting for fares?

This post deals with the design of a taxi rank and how to reduce the pollution created by idling and edging foroward. A few answers suggested that making the taxis switch to hybrids, or even better ...
4
votes
5answers
55 views

How to prevent pollution caused by a taxi rank? Is there a solution to the 'edging forward' cost of cars in a queue?

I am looking at ways in which a heavily polluting taxi rank near a train station could reduce its pollution footprint. My first thought was that the pollution was mostly down to idling and I am ...
4
votes
2answers
393 views

Preventing idling - ideas to keep warm in a car when the engine is off and it is cold outside

I have asked a few people whose cars are idling if they mind switching them off to reduce pollution. One response I get from quite a lot of people is that they need to keep the car running to enable ...
3
votes
2answers
42 views

Relationship between Protein Content of Wheat and the use of Pesticides

Today I heard a news story on local radio about a farmers protest campaign in Hamburg (Germany). Currently in Germany the discussion about sustainability, climate change and environmental protection ...
5
votes
2answers
91 views

If everyone had an 'American carbon footprint', how much would the world's temperatures increase?

I'm trying to create a formula that would show: If every citizen in the world had an average carbon footprint of X.X kg per month, global temperatures could rise by X.X degC by 2050. I know there ...

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