- Soil management: Anytime nitrogen gets added to (or is even present in) soil, microbes convert at least some of it to N2O. So use of any fertilizer that contains nitrogen, “nitrogen-fixing crops and forages”, dumping “crop residues and[/or] sewage sludge” onto soil, “high-organic-content soils”, and yes, animal droppings could be contributing to global warming. I know this is one thing the vegetarians will seize on and claim the best way to be green is to go veggie, but honestly, given the importance of nitrogen in helping plants grow, I’m not sure there’s much that can be done here. I mean, to get the most headway, we’d not only have to reject meat, but beans, corn, and barley (although less beer might be a cause for celebration) as well, not to mention rejecting any nitrogen fertilizer when that contains the most potential for sustainability. But don’t worry, I’ll throw in a few more things we can look at to make up for it: iron/steel production, “mobile sources” of N2O, coal mining, cement manufacture, and methane from manure management.
- Landfills: Specifically, organic wastes such as yard wastes and food, which the microbes get into again. Recycling seems to be pretty strong in the United States, but composting as an environmental policy is only starting to gain steam. Some places have separate services for the collection of yard wastes. Also, according to the EPA report, many landfills, including the largest ones, collect the gas emitted by their landfills and combust them – which produces carbon dioxide, but again, CO2 is, all else being equal, much less of a warmer than methane. Still, stopping more stuff from going into landfills is the best approach here.
- Natural gas: …is mostly methane. Some methane is leaked from petroleum as well because oil and gas are often found near each other, but gas is the major source. I’m not quite sure how that changes the relationships between the fossil fuels in terms of what’s most polluting. Read on over the weekend to find out why this is just one beef I have with T. Boone Pickens.
- “Enteric fermentation”: Mostly applies to ruminant animals, so when you’re eating pork or fowl, compared to eating beef you’re actually helping the environment! Dairy might be worth foregoing, but improvements in efficiency have allowed cattle populations to decline from 1995-at least 2002.
- “Substitution of ozone-depleting substances”: This refers to chemicals called HFCs and PFCs, which are regulated by the Kyoto Protocol, being used as replacements for the last environmental panic, ozone-depleting CFCs, which were long used in refrigeration and firefighting. It’s important that as alternatives are developed that don’t harm the ozone layer or cause a greenhouse effect, they are spread to developing nations like China and India, and to the rest of the developing world, with all due speed.
- Production of iron and steel: Here’s something I had to go to Google to learn more about. Here’s what I learned from here, from an International Energy Agency report: This is largely because a lot of coal tends to be used in the process, and improvements in efficiency can only continue to help. Some countries engage in “waste energy recovery” which can be used to generate power and help the overall fossil-fuel issue. This is another thing that will probably never significantly go away entirely.
- “Mobile sources” of N2O: Fuel combustion can produce N2O in addition to CO2, which is one reason I don’t trust biofuels. This will be one of my criteria when I look at alternative fuels for our cars: low nitrogen content, not just low carbon content.
- Coal mining: Methane was produced when coal was formed and has been trapped since, and coal mining releases it. A lot of it is required by law to be directed to the atmosphere or else it’ll blow up. Obviously this will become less of a problem as we reduce our use of coal, but methane recovery schemes are progressing in the meantime and surface mining has grown popular, if sometimes controversial.
- Cement manufacture: CaCO3 (calcium carbonate) is heated and produces CaO and CO2, the former of which becomes part of the process of making cement. According to the IEA: China, which produces nearly half the world’s cement, has gotten better at preventing too much in the way of CO2 emissions. Use of substitutes for clinker (unground cement) could improve CO2 emissions.
- Methane from manure management: Basically, this means don’t keep animal manure in an environment that doesn’t allow oxygen to reach it. “Solid waste management” and cooler, drier conditions are better for taking care of manure.
So that takes care of nearly 20% of global-warming-causing emissions. Over the weekend, we’ll look at the other 80%.
Many early voting registration deadlines are tomorrow, and trust me, it’s not really as hard as you think it is unless your state is actively trying to get you not to vote.