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> yield. Napkin maths on that makes it just require about Australia of farmland (if I remember) to offset the world's CO2 emissions. For a year? And can you of
by lostlogin 2y ago
> yield. Napkin maths on that makes it just require about Australia of farmland (if I remember) to offset the world's CO2 emissions.
For a year? And can you offset them again the following year by adding more the next year?
- defrost 2y agoFirst you need to clear, plough, seed, and ... much harder, water, an "Australia worth of farmland". Every year. That's a lot of transport energy, a great deal of fertilizer, and a continent's worth of liquid gold. Don't forget the additional area required to offset the energy expenses of that annum's worth of additional agriculture.
- lostlogin 2y agoI misunderstood - I read that as 'an amount of farmland equivalent to Australia's'.
- defrost 2y agoHmm, I haven't chased that detail down myselg (busy ATM), but I strongly suspect the area intended was that of mainland Australia (or, close to equivilantly, the area of mainland lower 48 contiguous USofA). Certainly a detail worth checking, farmland in Australia is much less than the area of Australia.
- AngryData 2y agoAlso nitrogen fertilizer is produced using fossil fuel derived hydrogen. Making green fertilizer from the air is possible but requires a 10x increase in energy input into a process that is already one of the worlds most energy intensive industries.
- defrost 2y agoIt's on the list: https://energy.fortescue.com/en/green-energy-tech/green-ammonia https://energy.fortescue.com/en/green-energy-tech/green-ammo... https://www.fertilizerseurope.com/paving-the-way-to-green-ammonia-and-low-carbon-fertilizers/ https://www.fertilizerseurope.com/paving-the-way-to-green-am... https://www.yara.com.au/crop-nutrition/grow-the-future/sustainable-farming/green-ammonia/ https://www.yara.com.au/crop-nutrition/grow-the-future/susta... with capital investment and scheduled ground breaking on plants: https://energy.fortescue.com/en/our-green-projects/gibson-island https://energy.fortescue.com/en/our-green-projects/gibson-is...
- pfdietz 2y agoHow does it require 10x the energy input? That makes little sense.
- defrost 2y agoI haven't run any numbers but I suspect they're referring to the energy cost of cracking water for hydrogen Vs. the energy costs of bleeding off and saving hydrogen as a side product from LNG and hydrocarben wells.
- pfdietz 2y agoEven that makes no sense. Turning methane in electrical power is about 60% efficient in combined cycle plants. Electrolysers are at least 50% efficient. Where is this 10x coming from?
- defrost 2y ago> Where is this 10x coming from? You would have to ask them again, demanding their thought process or sources from third parties like myself is fruitless.