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7 votes

Is oil actually a renewable and sustainable resource, but we just use much too much of it?

What does renewable mean? Wikipedia defines a renewable resource as (emphasis added): a natural resource which will replenish to replace the portion depleted by usage and consumption, either through ...
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4 votes
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If we can capture landfill gas, why can't we capture cows' burps and use them as a source of energy too?

How do you propose capturing methane laden cow burps? Land fill sites are stationary and inanimate. Getting methane out of a land fill site basically involves putting some pipes into the back fill ...
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4 votes
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Electricity need to switch all cars from fossil fuel

By order of magnitude your approximation is reasonable. I compared it to a 2021 analysis performed by Mark Jacobson as part of his 100% Wind, Water, and Solar (WWS) All-Sector Energy Roadmaps for ...
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3 votes

What is the typical embodied energy of a solar photovoltaic panel?

Energy payback in 1-6 years Taking manufacturing variables into account basically gives you a range of time from 1.25 - 6.5 years based on 5 sunny days out of seven and an average of 6-8 hours of sun ...
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  • 86
3 votes

What is the most sustainable way of making coffee?

TL;DR Get your coffee beans with rainforest alliance certification Drink it black or with non-dairy whiteners Full answer: I think the points you mention are relatively trivial compared to the big ...
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  • 308
3 votes

Is burning wood for energy less bad than forest fires?

It's the timescale that's the issue. Firewood is generally harvested from a managed forest; there's a continuous cycle of planting, harvesting, and burning going on, and the carbon dioxide released ...
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3 votes
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Can energy be both sustainable and reliable?

There are very many ways energy can be sustainable and reliable at the same time. Firstly, you can observe the fact that there is no renewable energy. Most so-called "renewables" (a misnomer)...
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  • 3,025
3 votes

Can energy be both sustainable and reliable?

If you want to include a means of energy storage within the system then yes. Batteries can be used to store electrical energy for when the sun doesn't shine and when the wind doesn't blow, when the ...
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2 votes

Electricity need to switch all cars from fossil fuel

In my country, a typical motorist drives 15000 km/year. With state of the art electric cars that consume less than 0.2 kWh / km, and taking into account charging losses (that bring the total ...
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2 votes

What is the typical embodied energy of a solar photovoltaic panel?

Typical period would be 2 years for embodied energy payback, using a nominal 200 peak watt per square meter and 600 kWh embodied energy. Sunny regions have over 5 peak solar hours per day and more ...
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2 votes

Is environmentally-driven purchasing of coal mines a good idea?

No this won't work, because there's so much coal reserves, unless you buy all of them. With oil it might just work. Buy an oilfield and promise to not utilize it in any manner. However, the fossil ...
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2 votes

What do we do with all the coal mines?

Abandoned underground coal mines present a potential hazard to anyone who might enter them. The first hazard is fugitive methane gas and the second is coal dust. Under the right conditions, both can ...
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2 votes

Renewable energy gravity storage

Let's look at the specifications of EnergyVault. Firstly, the tower height is claimed to be "nearly 500 feet" or nearly 150 meters. However, since the tower consists of bricks, an average ...
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1 vote

How much energy would it save to park cars in the shade in summer?

Not very much. The parts of interest to cool are the seats and the air inside the car. If the cabin is three meters long, 1.5 meters wide and 1.5 meters high, then there's 6.75 cubic meters of air. At ...
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  • 3,025
1 vote

Can oil be used as a fuel source without contributing to global climate change?

There are two ways oil can be used as a fuel source for energy without contributing to global climate change. The first is carbon capture and storage. However, part of the allure of oil is that it's ...
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1 vote

Can oil be used as a fuel source without contributing to global climate change?

Not of itself. Using oil as fuel means burning it and that means producing carbon dioxide. There are a lot of things we can do after burning oil to avoid releasing the CO2 to the atmosphere, but none ...
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1 vote
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Is burning wood for energy less bad than forest fires?

Another thing to consider: If burning wood for energy, it is generally displacing other alternative dirty fuels that would emit net carbon dioxide. However, forest fires do not displace anything. It's ...
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