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Earth

A Surprise Contributor to Climate Change? Food Waste (theguardian.com) 178

The Guardian writes: About a third of all the world's food goes to waste, and producing, transporting and letting that food rot releases 8-10% of global greenhouse gases. If food waste were a country, it would have the third-biggest carbon footprint after the U.S. and China...

Food waste fell sharply last year during lockdown as people stuck at home began to use leftovers, plan meals and freeze food rather than throw it away. Once lockdown ended, however, food waste rose again.

Their conclusion? "Cutting food waste can help the climate."
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A Surprise Contributor to Climate Change? Food Waste

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  • In order for people not at home to eat, someone else has to cook for them. This takes time, and rather than wait, most people at lunch would rather get something that is already prepared or half-prepared so they're not 2/3 of the way through lunch before they even get their food. This, in turn, requires guesswork on the part of the proprietors preparing and vending that food and sometimes they're going to guess wrong. Or it's more profitable to throw food away at the end of the night than to turn away custo

    • Or it's more profitable to throw food away at the end of the night than to turn away customers at the end of the night.

      They could give the food away to the homeless at the end of the night, reducing their need to steal or panhandle to eat, and also somewhat reducing the amount of prepackaged foods they consume.

      • You'd think so, but it took a public outcry for something like this to take off.

        A while ago, a national supermarket chain got a HUGE load of bad press for the practice of dumping bleach all over "waste" produce to discourage bums from digging through their dumpsters for something edible. So they started a PR campaign where they now cooperate with the local homeless kitchens, they deliver the leftovers and stuff they can't sell anymore.

        I have it on good authority that it's SO much that they can't even use it

        • I have it on good authority that it's SO much that they can't even use it all before it rots away.

          I hope they're composting the rest, even the meat can be composted with some special enzymes etc. That's something that society needs to get more on top of. High-tech composting has lower emissions and happens faster.

          • I think they hand it over to a "retirement" home for aging animals nobody wants anymore where they may live out their last days instead of being sent to some kind of knacker.

          • by sfcat ( 872532 )

            I hope they're composting the rest,

            You do realize that mostly food does that anyway over time.

  • by burni2 ( 1643061 ) on Monday September 06, 2021 @07:52AM (#61768527)

    Ok I will iterate because the Guardian article cannot be really called article more like "burp" - that's not a big surprise.

    0.) Its greenhouse gases plural, CO2 is one greenhouse gas but makes up the majority by mass of all, however there is also CH4 (methane) that per weight unit has a higher greenhouse factor than CO2, furthermore is R-134a (AC-gas), N2O (laughing gas), and so on ..

    1.) You produce food
    agriculture -> needs -> fertilizer

    Fertilizers are from
    - minerals (mining) -> mining needs energy
    - nitrogen synthetesis based (you need energy = CO2 to produce them)
    - direct use: organic/poop/pee -> which contain CH4 and still active bacteria that produce CH4

    livestock -> needs -> food from agriculture (soy, wheat, corn)
    Feeding livestock food produced by agriculture will put the CO2-footprint for the fertilizer onto the meat

    PLUS livestock especially cows produce methane during digestion

    Also plants have a higher efficiency in contrast to livestock (this is the reasoning behind -> eat "less" meat to help the climate)

    2.) you dump food / food residue
    If it's old and has mold you dump it.

    This dumped food (residue) is often dumped untreated into landfills where the organic residue is converted by bacteria to methane which escapes the landfill into the atmosphere (older landfills can be covered by plastic foil, but )

    Or the food residue is heat treated (burned) then you need to supply extra fuel (currently carbon based) to remove/convert any organic compounds that can be used by bacteria to produce methane

    Sounds strange spent fuel and release CO2 to minimize methane production? -> No, it is just a trade off, because methane as mentioned above has a much higher greenhouse factor.

    3.) You transport food
    If you would waste less food, less food would be transported and less food transported would reduce the amount of CO2 released by transport. (Eat less, stay thin)

    • All a fallacy, the things die and rot in the biosphere anyway, and that overshadows by far the amount of "food" rotting, it's a rounding error.

      • I think the point is that if you didn't need to produce 30% of our current food in the first place, then we reduce the scope 2 emissions (fossil fuels required to transport it, etc) by 30%

        I don't think it's so much the CO2 of the food itself when it decomposes because that's already in the carbon cycle.

  • by coofercat ( 719737 ) on Monday September 06, 2021 @08:05AM (#61768579) Homepage Journal

    I realise the CO2 in food is mainly from its production - throwing it away doesn't suddenly release all that CO2. However, I wonder what effect composting has on all of this? Disposing of food waste to make compost (or at least, to enrich existing soil in some way) is presumably better than putting it in landfill (where, deprived of oxygen it tends to produce all sorts of hellish gasses, not least methane). The other point of course is that if your food waste is collected by your local refuse people, then they have to drive diesel guzzling heavy machinery to do it - so compost at home if you can (I just got a hot compost bin to try this out).

    Of course the ideal is that we don't throw it away in the first place, which I get - I'm just wondering what's best to do with the carrot tops and eggshells...?

  • "About a third of all the world's food goes to waste"

    Which is funny (sad) because while about 9% of the world's population are ACTUALLY starving, it's estimated that ALSO about 1/3 are nutritionally deficient (ie that 'other 24% on top of the actually starving' are getting food, just shitty food that's making them unhealthy*),

    *this is people who /don't have a choice/. Fatties in the western world who preferentially live on Doritos and Mountain Dew aren't counted.

    • The problems with starvation around the world comes from shit-hole nations with corrupt and/or incompetent governments. Western nations are typically quite generous with gifts of food, fuel, and medicine but corrupt governments will leave the food to rot or sell it off elsewhere. If it is not corruption then it is incompetence, where people come to government positions not by merit but to give jobs to the inept as political favors.

      We are seeing this happen in South Africa where productive farms are being

  • This just in: surprise contributor to greenhouse effect and climate change: people's farts.

    News at 11.
  • by PPH ( 736903 )

    Won't someone please think of the bears [gannett-cdn.com].

  • Conclusion: Nothing short of reducing our population will help. Fuck all the Band Aid fixes.
  • If we're being honest, this is merely a distraction away from the sectors that are known to be massive contributors of GHGs. Not that it matters because we are f, u, c, k, FUCKED.

    • by sfcat ( 872532 )

      Not that it matters because we are f, u, c, k, FUCKED.

      Or we could use nuclear to de-carbonize the grid and produce fuel to replace extracted fossil fuels. Or did you believe that solar panels would power your car and that would be more efficient in terms of extracted resources?

      • You misunderstand because it's way too late for any of that.

      • Industrial plants have made Z E R O changes to reduce the amount of CO2 they emit. The changes in power generation are minimal and mostly still pollute. It's game set and match and humanity lost.

  • by slashdot_commentator ( 444053 ) on Monday September 06, 2021 @09:46AM (#61768835) Journal

    Rotting food may generate CO2 as part of its biological process. But one needs to realize that biological activity covers the planet. You're not going to regulate plant growth or food production in order to lower CO2 levels; they're part of the O2/CO2 equilibrium of the surface of the planet.

    What causes CO2 global warming is the extraction of carbon from the ground (called petroleum/nat gas) and converting it to CO2 that gets released in the air; a manmade transfer of carbon sequestered deep into the earth into our atmosphere. At *best*, reducing food waste will depress the agriculture industry to produce less food "destined" to be wasted, which would mean less petroleum extracted & converted to nitrogen fertilizer.

    If you want to avoid global catastrophe caused by the CO2 production of our civilization, the most effective means to accomplish this is to remove combustion engines from the the global economy, by replacing it with electricity based devices, and doing everything possible to generate electricity without using petroleum. That's solar, wind, geothermal, and yes, properly implemented and managed nuclear power.

    • by Subm ( 79417 )

      "For every 12 calories we put into the food system, we only deliver 1 calorie for human nutrition" -- ARPA [energy.gov], with sources within.

      Most food energy comes from fossil fuels, not sunshine, so food waste causes drilling and burning more fossil fuels. It doesn't have to be this way, and before the Green Revolution, it wasn't, but it is now.

      As for your ways to reduce CO2 emissions, you suggested replacing combustion engines' electricity but not simply reducing the need. Not wasting food and regenerative agriculture

      • Wish I had some mod points for you both.
      • As for your ways to reduce CO2 emissions... turning off the a/c when not home

        In all seriousness this is probably false, at least for a typical day. If you turn your AC off during the day then turn it back on when you get home, it's pulling a huge amount of energy to extract all that heat in your house right as everyone else is also pulling more energy. That energy is almost certainly being produced with fossil fuels, even in areas with high renewables penetration like California. In fact it's even worse because those peaking fossil units are even less efficient than baseload unit

    • The problem is not the "rotting food". That is a zero sum game.

      The problem is the fuel and energy invested producing that food ... that all could be saved if we would:
      a) produce less food
      b) transport less food
      c) -> not throw away the surplus food

      The surplus food could even be used to feed lifestock: bit it is not.
      (Obviously it makes no sense to realize as super market manager in the evening: Woh, this is spoiled (out of date) I have to throw it away", and then try to ship it into a famine zone)

      • You're not going to regulate plant growth or food production in order to lower CO2 levels; they're part of the O2/CO2 equilibrium of the surface of the planet.

        The only thing that is going to slow down the increase of global temperature is a significant, if not radical reduction of CO2 production. We're at the point where the world needs to ban the use of coal. (Good luck getting China to go along with that.)

        Nipping at the edges with greater efficiency in food production will not help avert the catastrophe!!!
        Stop trying to advance idiotic notions concocted by petroleum companies (and/or science funding bureaucracy) to avoid the real solution!

  • Nations with the lowest per capita CO2 emissions get a large portion of their energy from one of three energy sources. Those are hydroelectric dams, geothermal power, and nuclear fission. What is great about these technologies is that not only are they low in CO2 emissions but also reliable, low tech, and therefore low in cost.

    Lowering CO2 emissions from lighting can come from switching from incandescent to LED lighting but a far greater gain can be had in fixing where the electricity comes from. When it

    • Nations with the lowest per capita CO2 emissions get a large portion of their energy from one of three energy sources. Those are hydroelectric dams, geothermal power, and nuclear fission.
      Simply: nope, to all three.

      Find me a country that uses "geothermal power" to create electricity. Oh, you found one? Good. That was easy. Now: find me a second one? Oh ... waiting ...

      • How do you respond to people asking you to back your claims? Oh, I remember, "Google it". So, until you start answering people's questions with anything other than "Google it" you can assume that's my reply to any request from you that I back up my claims. If someone else asks then I'll respond to them.

        It appears you are following me around asking me to back up my claims, tossing insults, saying I'm wrong and providing no counter evidence. Not only that but you are the ONLY person doubting my claims. S

        • You make claims all the time about this and that.

          And you are usually so wrong, that it is pretty clear you never researched/googled anything regarding such claims.

          So: learn to google.

          Or alternatively (that would be preferred): get an education.

  • I'm pretty sure that if all the articles about climate change were not written, the amount of CO_2 being blown into the atmosphere would drop by 50% due just to that.

  • Food waste fell sharply last year during lockdown

    When there was much less eating out. Either because establishments were outright closed or because the numbers of eaters was reduced due to distancing requirements and reduced seating capacity. While some of that would be cancelled by people buying and eating more at home, that shift isn't quantified. Neither is there information about whether the total amount of food produced changed: up or down.

    Rather than just saying one-third of the world's food is wasted, it would be helpful to know how this is class

  • 09% Waste food, per this article; 1/3 of all food
    18% Unwasted food. Total food = 27% of greenhouse gas.

    OK, that's a start. It does seem odd that food alone is such a large contributor to this massive worldwide problem. Where would the other 73% come from?

    42% Power generation worldwide.
    16% Cattle, other gassy animals
    18% Commercial ocean vessels

    But hey, wait a minute! We're already over 100% and there are plenty of categories left to consider as sources of evil pollutants.

    15% Commercial trucking
    12% Ai

  • Seriously, the majority of restaurants I go to, the portion sizes are larger than my appetite. And I'm a 200 lb guy, so it's not like I have a tiny appetite. Sometimes I can eat just half and save the rest for another meal. I'd imagine a lot of people can't finish the whole meal either, and food gets thrown out as a result.

    Of course, why would restaurants reduce portion sizes, when they can keep them large and charge higher prices?

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