31 votes
Accepted

Why does the cost of planting trees vary so much across different websites?

There are different levels of service. In itself planting a tree is very easy and cheap, of the 3 billion trees in the UK, most drop thousands of seeds each year and some germinate all by themselves ...
12 votes

What's the fastest growing plant by carbon density?

Ecologists refer to this as 'gross productivity' and define it to be dry weight plant matter per area per year. In temperate climates this is likely to be a grass. Switchgrass has been proposed as a ...
9 votes

Would “Guerilla Gardening” help combat climate change and/or be feasible/legal?

I think you're up against two three at least four separate problems: The scale: rallying 1M people to plant 16k trees apiece over 20 years is no way a "guerrilla" operation; it's a mass movement. It ...
7 votes

What's the fastest growing plant by carbon density?

One way to look at it to compare like with like is to look at the photosynthetic efficiency since carbon is fixed through photosynthesis. By this measure, sugar cane comes on top, converting about 8% ...
  • 304
7 votes

Why does the cost of planting trees vary so much across different websites?

Any time you want to give money to a charity, you should do some basic research on how the charity spends donated money. Some charities spend over 90% of donated funds on charitable works, with ...
  • 171
5 votes

What can an individual do to meaningfully practice carbon capture?

It is much easier to avoid emissions than to capture CO2. Anyway, one can roughly prioritize as follows: Leave it to professionals. There are expert organizations that focus on CO2 reduction. This is ...
4 votes

What's the fastest growing plant by carbon density?

Since grass and switchgrass already been mentioned; Hemp and Paulownia tree may be the alternative answer. They are among the fastest growing plants. For hemp, one unit land area of hemp(s) can ...
4 votes

What is required to make air travel sustainable?

Another option that could be explored (and indeed is, to a limited extent) is the increased use of airships. Being neutrally buoyant, they need much less energy per trip, and the propulsion could be ...
  • 763
4 votes
Accepted

What's the applicability of biochar?

No, and no. Current production costs of biochar are in the hundreds of dollars per tonne. (It shouldn't be that expensive.) By comparison the mining costs for coal at my neighbor, the coal mine, ...
4 votes

tree for carbon sequestration in temperate climate

As soon as you plant a forest it starts to decay. Initially the growth rate is faster than the decay rate. At some point it reaches equilibrium. To maximize carbon capture you want to plant ...
4 votes

Is biochar actually a viable way of carbon sequestration?

The answer is: Unknown. So try it. We need more data points. In general if energy can be extracted from a reaction, some bacteria does it for a living. Given the nature of certain ecozones, ...
4 votes

What is the minimum indoor CO2 concentration that is achievable using houseplants?

The short answer is no, not anywhere close to 200ppm and not appreciably lower than ambient conditions. The modern standard for buildings is a full air change every three hours. This means your ...
3 votes

Why don't we use cattle to re-store CO₂ in the soil?

Both of the links you shared are important videos to watch for anyone interested in learning about the process and should be considered required viewing material in classrooms where agriculture is ...
3 votes

tree for carbon sequestration in temperate climate

An unexploited forest has many benefits but carbon sequestration is not an exclusive driver. You can invert the logic and argue that any wood used for making durable things is an additional carbon ...
  • 304
3 votes
Accepted

tree for carbon sequestration in temperate climate

Gail Taylor's team at the University of Southampton is looking at almost exactly this question. Their primary focus is on fastest-growing bioenery crops, but the answer is going to be pretty much the ...
  • 14.6k
3 votes

What is required to make air travel sustainable?

Air travel sustainability problems, even if you limit the category to climate change impacts, are not limited to greenhouse gas emissions. Atmospheric transport of emissions is difficult and, since ...
3 votes
Accepted

Is grass efficient for carbon sequestration?

I found this article regarding lawns. It suggests that lawns could be regarded as carbon sinks only if they are not (frequently) mowered, and do not use pesticedes. Also: An acre of established ...
  • 598
3 votes

What is required to make air travel sustainable?

For all-electric passenger jets, battery capacity must increase to hold four times more energy per unit mass Currently available batteries have poor specific energy compared to jet fuel: Jet fuel: ...
  • 11.4k
2 votes

Would “Guerilla Gardening” help combat climate change and/or be feasible/legal?

Your calculations are way off. One cubic meter of wood harvests about 1 tonne of carbon dioxide. An average tree is 0.6 cubic meters so that's 0.6 tonnes of carbon dioxide per tree. To reduce ...
  • 3,454
2 votes

Is grass efficient for carbon sequestration?

I wonder how much carbon dioxide does grass sequester, compared to trees. Moreover, is grass still efficient in absorbing pollution? It seems to me that grass would be more efficient in storing carbon ...
  • 3,454
2 votes

Is grass efficient for carbon sequestration?

I believe its all about mass, biomass is effectively sequestered CO2. In year one a lawn probably has a greater mass than a one year old tree, and so more CO2 sequestered. But in year twenty the tree ...
2 votes

How can I separate carbon monoxide from wood gas?

If you are going to use wood gas to run a generator, don't bother removing the CO. Burn it. https://www.youtube.com/watch?v=X3KipK49v7g is a vid on making a woodgas powered truck. That said: ...
2 votes

How can I separate carbon monoxide from wood gas?

This master's thesis by Dahiru Rufai Ahmed at the university of Oulu provides a comprehensive background into the removal of CO2 from wood gas. On pages 36-37 it mentions the water-gas shift (WGS) ...
2 votes

Would moving baby trees help with carbon sequestration?

By moving a tree from one area to another, that's -1 tree to the source and +1 tree to the destination, for a net change of 0 trees over the region. That probably won't make much of a difference ...
  • 2,769
2 votes

Would moving baby trees help with carbon sequestration?

I think you'll find that in areas where forests are managed, baby trees come from a central location the only purpose of which is to grow lots of these small baby trees. The trees are used to create a ...
  • 3,454
2 votes

Is anyone developing direct carbon capture for home HVAC system based on natural gas?

This is not practical. There are two main ways in which carbon dioxide can be captured from gas burning equipment. One is that there's a plant that liquifies air and creates a pure stream of oxygen. ...
  • 3,454
1 vote

Hyper carbon accumulator(s) for backyards

This article (and the "Part two" it links to) gives a lot of technical detail and some practical advice: Why Not Start Today: Backyard Carbon Sequestration Is Something Nearly Everyone Can Do. In ...
  • 981
1 vote

Why don't we use cattle to re-store CO₂ in the soil?

Cattle have become unpopular because they have been accused of farting methane. This is the main answer to your question. However in ecologically sound pastures cattle do restore CO2 to the soil, and ...
1 vote

Quantity of new trees needed to compensate all human CO₂ pollution

Trees follow the logistics curve for growth. More complicated, the number of trees descreases as they get larger. E.g. after a forest fire, lodgepole pine sprout at about 10 per square foot. In 10 ...
1 vote

Is biochar actually a viable way of carbon sequestration?

There are many problems with the article you cited, but I agree with the main point it makes about the need for extensive research before any global scale solution should be attempted. Nevertheless, ...

Only top scored, non community-wiki answers of a minimum length are eligible