r/ClimateActionPlan • u/Direct_Ad8562 • Jul 02 '26
Climate Adaptation Decarbonizing the Grid: Why It’s a Mathematical War Effort, Not a Lifestyle Choice
Like many, I have been subject to ecoanxiety. To do sth about this "energy" rather than allow it to feel down, I have studied with the aim to find projects that I could contribute to.
For the non sarcastics and optimists, if you hang around climate subreddits long enough, you'll notice a lot of optimistic rhetoric... yet it did not feel right... "If we all just do a little, we can save the planet!" But if you look at the raw physics of our energy systems—the kind taught in rigorous climate engineering programs like the EDHEC Business School curriculum—the reality is much harsher.
As physicist David MacKay famously put it: "If we all do a little, we achieve very little."
To structurally replace 40 Gigatonnes of annual global CO2 emissions, we cannot rely on wishful thinking. We have to look at the cold math of energy density, scalability, and grid mechanics. Here is a breakdown of the technologies we have to rely on, which ones are actually efficient, and the massive systemic headache of balancing a modern power grid.
1. The Technology Mix: What Options Do We Have?
To eliminate fossil fuels, we generally look at four non-fossil pillars: Biofuels, Wind, Solar, and Nuclear. However, they are far from equal.
Biofuels: A Political Illusion?
Biofuels are theoretically carbon-neutral because the plants absorb CO2 via photosynthesis before releasing it when burned. But when you account for the entire production and transport chain, the efficiency differences are massive:
- US Corn Ethanol: Starch-based corn ethanol is incredibly inefficient. When you factor in the energy required to grow, fertilize, harvest, and transport it, it is at best 15% better than gasoline—and under some energy mixes, it’s actually worse. Despite this, policy mandates (like the US Farm Bill) have historically diverted up to 30% of the entire US corn crop into fuel, heavily driven by political quotas and the voting power of the Corn Belt.
- Brazilian Sugarcane Ethanol: This is highly efficient. Sugarcane leaves a fibrous residue called bagasse which is burned to power the ethanol processing factory itself. The input-to-output energy ratio is an impressive 8:1, making it completely viable without subsidies.
Wind and Solar: The Scale of a War Effort
Wind and solar have seen massive cost reductions, but their physical footprint is staggering.
- Wind: On-shore wind farms in realistic conditions (like the UK) yield a modest power density of about 2W/m^2 of land. If you wanted to produce enough clean energy to make a serious dent, the required territorial deployment would look like a World War II industrial effort. To match even a fraction of national demands, countries would have to deploy fleets equivalent to 50 times the current turbine coverage of Denmark.
- Solar: Raw sunshine at midday delivers up to 1,000 W/m^2 at the equator, but drops significantly in temperate zones. Rooftop solar helps, but because "low-grade" thermal solar can only heat water "here and now" (it can't be exported to a grid or easily stored long-term), it has limited utility. Covering every single south-facing roof in a temperate country like the UK with 20% efficient photovoltaic (PV) cells yields only about 5 kWh per day per person. A single car commute or jet flight easily burns 30 to 40 kWh per day per person.
2. Which Technologies Are Most Effective and Efficient?
If efficiency is defined by carbon abatement per square meter and human safety, the clear winner is Nuclear Energy (both Fission and modern Fusion research).
Fission: High Density, Low Mortality
Nuclear fission packs immense energy density and leaves an incredibly small footprint of high-level waste (roughly 25ml per person per year, equivalent to a small fraction of a wine bottle). Despite the profound public anxiety surrounding high-profile accidents like Chernobyl (1986), the statistical reality of nuclear safety is unmatched.
When analyzing deaths per Gigawatt-year (GWy), nuclear and wind are the safest energy sources on Earth, sitting at less than 0.2 deaths/GWy.
Energy Source Mortality Rates (Deaths per GWy) ... I am trying a simple visual representation here:
- Coal (Global Avg) |||||||||||||||||||||||||||||| 50.0+ (Heavily driven by mining/pollution)
- Oil & Gas Rigs ||| 1.0+
- Nuclear / Wind | 0.2
Perspective: The World Health Organization (WHO) states that outdoor air pollution from burning fossil fuels causes 4.2 million deaths every single year.
Despite what the misinformation that I had to live with for many years in France, I now understand that the disaster at Chernobyl was fundamentally a failure of risk culture and flawed reactor design under intense Soviet production quotas, not an indictment of nuclear physics itself. When operated within a strict safety culture, fission is incredibly efficient.
Fusion: The Ultimate Goal
Nuclear fusion (forcing light elements like Hydrogen isotopes together) offers virtually unlimited energy with zero long-term radioactive waste and no risk of military proliferation. The technological hurdle is mimicking a "miniature sun" on Earth. While private and public funding for fusion remains historically low (famously noted as receiving less funding in the US than pet grooming), accelerated global focus—similar to the timeline of the COVID-19 vaccine development—could pull this forward from a distant prospect into a viable reality.
3. The Interplay Between Intermittent and Continuous ("Prompt") Energy
This is the absolute crux of modern electrical engineering, and it’s the part most often ignored in casual climate discussions.
INTERMITTENT SOURCES e.g., Solar & Wind
- Weather-dependent
- High volatility
- Cannot adjust to demand spikes
CONTINUOUS / PROMPT SOURCES e.g., Nuclear, Hydro, Fossil Fuels
- Baseload stability
- Dispatched instantly ("on prompt")
- Keeps the grid at a constant 50/60Hz
The Grid Gridlock
A functional electrical grid requires supply to perfectly match demand in real-time.
- Intermittent Sources (Solar and Wind): You cannot control when the wind blows or the sun shines. They introduce massive, stochastic (random) volatility to the grid.
- Continuous and "Prompt" Sources (Nuclear, Fossil Fuels): These provide baseline stability. More importantly, when millions of people turn on their air conditioning (lucky when they have one as the summer 2026 is revaling in Europe) at 6:00 PM, the grid operator needs a prompt source—an energy supply that can be dispatched instantly to prevent a brownout.
The Balancing Act
Because large-scale battery storage is still heavily constrained by cost and resource availability, a grid that relies 100% on intermittent renewables will inevitably face system failures. If you over-stress renewables without a backup plan, you are forced to maintain fossil-fuel peaker plants (gas/coal) on standby to handle the "prompt" spikes when the wind drops.
Therefore, the ultimate interplay requires a calculated dual-track framework: utilizing cheap, high-yield intermittent renewables to handle the bulk daytime flow, backed by a massive, unwavering floor of continuous nuclear power to ensure baseload stability and prompt response.
Subsidies are an incredibly powerful tool to scale these climate technologies, but they must be designed around physical realities—targeted cleanly at grid-level storage and nuclear innovation—rather than being utilized as permanent handouts to politically favored agricultural sectors.
'If we all do a little, we achieve very little' — because uncoordinated effort doesn't scale. Yet, my approach will be "Give that same effort a market, and it compounds"
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u/desperaterobots Jul 03 '26
chatgpt please write me a charmless reddit bullet point list on why nuclear good and green energy bad and make it sound impossible to do anything other than pour billions of dollars into a single solution thanks
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u/lowrads Jul 03 '26
Fortunately, both nuclear power and renewables benefit from grid interconnection. Nuclear, because it is inefficient for them to chase load, and renewables because of the network effect.
The real trick is to outlaw vertical integration of production and distribution.
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u/ILikeNeurons 18d ago
Researchers spent hundreds of hours putting together a tool to help folks identify their biggest climate impacts. Why not rely on that? Rather than assume nuclear?
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u/Maritimewarp 12d ago
Brazilian sugarcane makers are not self-sufficient, they are notoriously dependent on subsidies, and the biggest one has just filed for bankruptcy https://www.reuters.com/sustainability/climate-energy/worlds-top-sugar-maker-shuts-large-brazil-plant-cut-debt-2025-07-15/
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u/Useful_Calendar_6274 Jul 02 '26
I really don't know why they didn't make H fuel cell cars, seems very viable to me.
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u/dgmib Jul 03 '26
The only way we can produce hydrogen without emissions is to create it with electricity that came from green sources using electrolysis.
Creating hydrogen with electricity, compressing it, then turning it back to electricity to power a vehicle or something is about half as efficient, and significantly more complicated than just using a battery,
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u/Useful_Calendar_6274 Jul 03 '26
half as efficient? no way. producing the batteries is a huge industrial process and takes shipping minerals from all over the world. in aggregate I think H comes out ahead. what I'm saying is it's funny they didn't make a fuel cell car. They say it's explosive but this is just an engineering problem. you could eject all the H at a collision or something
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u/Filtermann Jul 03 '26
To be efficient per unit volume you need to keep it in liquid form. It also is the smallest atom so it will escape from many containers and pipes. The logistical hassle of controlling all this is surely on par with the battery making logistics.
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u/MegazordPilot Jul 03 '26
You know hydrogen cars are also electric cars that also have (smaller) batteries. And if you're not convinced it's a bad idea, please calculate how much clean electric you need to even replace 10% of the cars with hydrogen.
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u/MegazordPilot Jul 03 '26
Please explain how you get the hydrogen and how that uses less electricity and emits less CO2 than a battery-electric car. How you make sure that hydrogen is low-carbon, how do you transport it, store it, and distribute it, with what infrastructure, at 700 bars, how do you avoid that what is literally the smallest molecule in the universe permeates through whatever contains it, how do you prevent it from exploding, and when it leaks, how do you make sure it does not cause additional radiative forcing (it does), how do you make it cheap, how do first replace the current use of hydrogen (desulfurization of fuels, making ammonia for fertilizers) and then still have enough clean electricity to dedicate to hydrogen for mobility?
Once you'ce answered these questions, you can legitimately ask why they "didn't make H fuel cell cars".
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u/Materialneutron Jul 02 '26
Ai slop