So my back of the envelope math says heating Mars' core from 1400°C (estimated temperature, exact value unknown) to the melting point of iron of 1538°C would take 8.21*10^20J or 2.2 billion TWh. So 100.000 times the current worlds yearly energy consumption.

How you produce that energy is kind of irrelevant, but assuming we use a perfectly efficient hydrogen bomb that somehow converts all it's mass into energy using deuterium tritium fusion, we'd need approximately 10.000.000 tons of hydrogen. Half of that deuterium and half tritium. That sure is one Big nuke ;)

Without doing the math, I'm pretty sure you could run an artificial magnetic field or just keep topping up the atmospheres for millions of years using less energy than it would take to move Ceres or melt Mars's core.

Because most power plants have them and big as they are, they usually dominated the picture. The power plant in the picture is in fact a coal power plant in South Africa.

I see the future of the cruise ship industry more in scrap metal.

>The only hurdle currently with green hydrogen is it’s energy requirements

Disagree on that. I think this is the major issue with hydrogen and the reason it's not competitive with BEV's and never will be. You speak about the availability of green energy as it that wasn't a major issue that we are already decades behind on. What matters now is that we reduce the amount of fossil fuel usage as fast as possible. There are two tools for that: 1. Increasing green energy generation 2. Reducing demand through more efficient usage. HEV's are, by their very nature, less efficient in terms of kwh/km than BEV's.

There are applications where using hydrogen makes sense. Personal vehicles are not one of them. Using our precious green energy for it is a waste.

I guess after decades of bad news, it could be worse. It's certainly a step in the right direction. But let's not forget that we'd need CO2 emissions to be rapidly declining by now, if we want to stick to no more than 2°C of warming by the end of the century.

Looks more like a Lion, I think.

What do you mean, industrial entities? What do you think diary farms are?

Global CO2 emission sources can be divided into five sectors of approximately equal size: Electricity generation, Heating, Transport, Industrial processes and Agriculture. We need to reduce emissions in all of these sectors. Agricultural emissions*,* largely coming from animals, are anything but trivial.

>Farmer owns cows. People eat his products. Cows fart. People tax cow farts and burps. Farmer can't afford to pay taxes per head of cattle so...

I'm with you this far, but then you go off the rails a bit. Here's what actually happens:

... Farmer raises prices to keep up with higher production cost. Animal products are now more expensive to buy. People change their diets to more plant and less animal based. Plant based food is now more in demand so framer expands production into areas previously used to produce animal feed crops. Emissions decrease. Land use decreases. Nobody starves.

Also, footnote: Yes, humans fart too. But humans have a different diets and are considerably smaller then cows. Thus human fart emissions are negligible in comparison.

So where does all the methane come from?

Not sure where that myth comes from, but when I stopped eating meat, my spending on food decreased by about 1/3. Meat is expensive.

That's right. There is no choice. If we want to keep this planet habitable in the long term, both need to be scaled back significantly.

Who's that? It increases the price for animal based food without an increase in plant based food. Thereby making the former less and the latter more competitive. That is literally the way you control consumption in a capitalist system.

People also do not associate agriculture and climate change as easily as you would expect. If we don't reduce these emissions drastically, producing food will become a whole lot harder, and therefor more expensive, over the coming decades.

So what will it be? Medium price increase now, or increasingly larger price increases over the coming decades?