Consider the pay back time. high efficiency lights are expensive. Expense is, at least in part, a measure of the resources used to make it.*
Replacing the fixtures in the kitchen where the lights are on 8-10 hours a day is probably a good idea.
Replacing the lights in the hall closet that runs 20 minutes a week is not.
Our kitchen has ...
The only one I'm aware of is Ecosia, which uses a substantial amount of the money generated through its search engine to fund tree planting (80% of surplus income according to Wikipedia).
More information here: https://info.ecosia.org/what
(Draft answer till I get around to find some figures)
There's a few ways I see to go about this: Running a Haber Bosch process or similiar with a non-fossile source for energy and H2, or finding other N sources. There's principally two routes, N fixing plants in crop rotation + organic fertilizer and reusing N-rich wastes and wastewater. The key difference ...
If you are asking about sustainability in general, I assume social aspects should be factored in.
DuckDuckGo follows a number of principles linked to privacy and openness. They tend to use and promote free software (also via donating to them every year), and they do not "bubble" you (i.e. restrict your search results) or track your activity.
Lilo is a ...
This question reminds me of
Can I recycle plastics at home by melting and molding?
Recycling paper at home
in that it is asking if it is possible to do some industrialized process at home. Well, of course it is, but that's only because anything is possible.
I think there are two ways of making bamboo fabric, sometimes called "bamboo rayon" and "bamboo ...
They definitely can be sustainable.
The crops themselves can easily be grown in a sustainable manner.
The plastic containers can be replaced with biodegradable containers, such as those made with corn.
Regarding price, that comes down to supply and demand as well as any governmental subsidies or regulation. It also depends on how much (if any) profit the ...
Note: the plants need nitrogen (for protein synthesis), not necessarily ammonia. Ammonia however is only one source of nitrogen. So I'm using the general term nitrogen below:
In practice this has already been done through various methods:
no-till: crop leftovers (e.g. stalks and husks from maize) are left on the field. Plowing is minimized or abandoned ...
I wanted to comment but since i can't...
Are you talking about the energy generation to produce fertilizer ? Then of course you can go non-fossil sources...you can use the sun the wind the water i think that if it is a closed environment you can even use the methane you generate to generate your own power
But what you should ask yourself is do you really ...
What are the most promising alternatives, in terms of the economics and scalability, to decarbonise steel production? Both for the reduction of iron oxide to iron, and for the iron-to-steel process?
I'll answer the first:
Direct reduction of iron oxide to iron using hydrogen.
There are several features that make this a promising alternative:
Magnesium Oxide based cements are interesting.
Here are the downsides when compared to portland cement:
They cure extremely fast so transporting pre-mixed cement doesn't work out.
Here are all of the upsides when compared to portland cement:
They are produced at a lower temperature and release less CO2 during the process than when compared to portland ...