What’s With The Carbon Myopia?
I recently came across an article that questioned the environmental credentials of resuable cloth bags vis-a-vis plastic carry bags (HDPE bags in this article). A couple of key points made in that article:
Conventional plastic bags made from high-density polyethylene (HDPE, the plastic sacks found at grocery stores) had the smallest per-use environmental impact of all those tested. Cotton tote bags, by contrast, exhibited the highest and most severe global-warming potential by far since they require more resources to produce and distribute.
The UKEA study calculated an expenditure of a little less than two kilograms of carbon per HDPE bag. For paper bags, seven uses would be needed to achieve the same per-use ratio. Tote bags made from recycled polypropylene plastic require 26, and cotton tote bags require 327 uses.
So the answer to the question the article raises "Are tote bags really good for the environment?" is "Hell, No!" right? Well, it's not that simple.
The article conflates enviromental impact with global warming potential (highlighted in bold above). So, if you go by global warming potential of the different bags, there would seem to be no debate here. In the life-cycle of a reusable cloth bag, the green house gas (GHG) emissions involved in the raw material production (growing cotton) and bag manufacturing itself end up being more than 300 times that of a plastic carry bag. So, unless you use the cloth bag over 300 times (thrice a week for two years), you're worse off in terms of climate change impact. But is climate change the problem we are trying to mitigate by switching from plastic bags to cloth bags?
Some facts:
Plastic bags constitute 10% of all trash generated in the US.
Plastic bags and plastic film constitute 25% of all trash recovered from the US East Coast despite their light weight per bag
Plastic bags constituted 10% of all trash collected from the stream and river systems in and around the city of San Jose
GHG emissions from plastic bags constitute 0.06% of annual GHG emissions globally
Plastic bags don't degrade natually and seem to last forever. Sea creatures eat them. Bigger sea creatuers eat smaller sea creatures that eat plastic bags. There have been several cases of threatened and endangered marine species that are found dead because they made an afternoon snack out of a plastic bag that travelled several thousand miles to their habitat. And then there's the Great Pacific Garbage Patch.
Even if the plastic bags end up in an intended end-of-life situation (recycling/incineration/landfill), it is still not without its issues.
Per the City of Cupertino's research, less than 5% of plastic bags end up being recycled. Unless the required quantity and quality of plastic is available to be recycled, this isn't even a profitable operation for the waste management company.
Most cities do not permit incinerators within city limits for air pollution-related reasons.
Landfills are not an environmentally benign option either. Siting a landfill is no easy task, and often leads to environmental justice issues. Lower-income and politically disenfranchised communities often end up with the landfills in their backyard, since the well-off and politically correct scream "Not In My Backyard (NIMBY)".
On the other hand, plastic bags contribute only 0.06% of global GHG emissions every year, from the energy and materials used in the raw material extraction and bag production. Even if you were to replace all plastic bags with cloth bags and use each cloth bag only 30 times, they would still only result in 0.6% of all GHG emissions globally. This number would go down with every subsequent reuse of the cloth bag.
Or in other words, choosing between a plastic bag and a cloth bag based on its life-cycle GHG emissions is like choosing between installing a water purifier and not installing based on its GHG emissions. The key factor in the former is trash, and in the latter is water quality, not GHG emissions. Or taking a non envionmental example, it is like choosing your car based on the weight of the rear view mirror.
So why is this article focusing only on carbon emissions and climate change impact? Actually, so is another article arguing against the switch to cloth bags : "Trash isn't the real problem. Climate change is." Yes, climate change is indeed the most pressing environmental issue that we face today, but is that reason for this form of carbon myopia? I think not.
The Atlantic article, in the second half of it, morphs into a not-so-subtle rant against smug, virtue-signalling, hybrid-driving affluent environmentalists:
Every product is manufactured and consumed with some ideal in mind. Pictures of tote bags—such as those from stock photo websites or advertisements—make the ideals we project on them visible. People are depicted carrying fresh fruits and vegetables in their tote bags at a sunny farmers’ market. These people are seen in intimate groups. They wear casual, modest, warm-weather clothing. They don’t handle digital devices. They take their bags to the beach, the park, art openings, concerts, through cosmopolitan urban communities and idyllic rural escapes. They are fulfilled and creative. They are middle class. They inhabit the landscape of tote-bag dreams: healthy, waste-conscious and ecologically responsible, conservatively ethnically diverse, carefree but productive, connected, affluent, tolerant, adventurous, optimistic. In short, they’re virtuous.
If the article were merely an avenue for the author to further a worthy cause first taken up by south park, it would be understandable. But when it detracts from the main issue at hand regarding plastic bags - trash, but worse, misinforms the readers about what environmental impacts to consider in choosing their grocery bags, it becomes a problem.
What's the solution then? Sadly, the environmental impacts of our choices are extremely difficult to measure and compare. As the tired cliche goes, the devil is in the details. The onus to identify the facts that matter in making an informed decision, unfortunately, falls upon us.
Something to think about, before you retweet the next article that asks "Is XYZ really good for the environment?"












