A Winery Carbon Footprint Self-Assessment: Why I Can't Give Us an "A" Despite All Our Progress
May 17, 2021
When you consider a winery's environmental footprint, what do you think of? Their vineyard certifications? Whether they're using recycled materials? How well insulated their winery building is? If so, you might be surprised to learn that the largest contributors to a winery's carbon footprint1 are the source of their energy, the weight of their bottles, the production of fertilizers and other inputs that go onto the vineyard, the transportation of the bottled wine, and the cover cropping and tillage decisions the vineyard makes.
This fact was driven home to me by a series of really interesting conversations about wine and sustainability over on Twitter recently which barely touched on wineries' vineyard practices. Kathleen Willcox published a great article on liquor.com titled Why Packaging Is Wine’s New Sustainability Frontier in which she highlights what a large piece of the total environmental footprint of wine comes from its packaging. The same day, Johan Reyneke, the South African winemaker whose commitment to organic and biodynamic farming has made him an example in his homeland and around the world, shared a review by Jancis Robinson, MW which praised his Sauvignon Blanc but called him out for the dissonance of using a notably heavy bottle for a wine made with such environmental sensitivity:
Some tough love from wine doyenne @JancisRobinson on some of our bottle weights and she’s right of course: sustainability doesn’t end at the farm gate. I truly love nature and take this criticism to heart. Back to the drawing board to see how we can do better. Watch this space... pic.twitter.com/Hx62KinlP7— Johan Reyneke (@ZAVineHugger) May 12, 2021
Reyneke's owning of the criticism and pledge to do better produced a lot of questions from other posters wondering what the relative importance of inputs like bottles, vineyard practices, winery design, and transportation each produced. In response, Jancis shared the below graphic, taken from the California Sustainable Winegrowing Alliance's 2011 assessment of California Wine's Carbon Footprint:
The graphic shows the huge importance of the glass bottle in a winery's overall carbon footprint, but also highlights other areas where a winery seeking to improve should look. It spurred me to go, category by category, and examine how we rate. In each case, I've estimated our own footprint compared to the "average California winery" benchmark noted in the CSWA graphic, with an explanation of how I got to my assessment. Our goal, in a perfect world, would be to get to zero, which would represent a 100% savings vs. the benchmark. It's good to have goals!
Note that these are self-assessments; we will be looking to do a third party carbon audit sometime in the next year. I'll be interested to know how my own assessments are contradicted or confirmed by the official ones. But this is at least a start. If you're interested in how I've assigned grades, I've given us an "A" if our own footprint in a particular category represents a better than 40% savings over the benchmark average. I've given us a "B" when our practices produce a savings between 15% and 40%. As it would in real life, a "C" represents an "average" performance, between a 15% savings and 15% extra footprint. A "D" represents between 15% and 40% extra footprint, while an "F" grade would be a footprint more than 40% greater than the benchmark.
In the Vineyard: Overall Grade A- (Benchmark: 34; Our use: 17; Savings: 50% vs. benchmark)
- Bio-geochemical field emissions: B- (Benchmark: 17; our use: 13) The CSWA's footnote defines this category as "Footprint associated with greenhouse gas emissions that are a result of natural bio-geochemical processes and impacted by local climate, soil conditions, and management practices like the application of nitrogen fertilizers." As we do not apply any nitrogen fertilizers, our impact here is likely smaller than average. We know because of our Regenerative Organic Certification audit that our soils are adding carbon content to the soil. The reduction in tillage and the resulting deeper root systems and more complicated microbial systems that we have been able to accomplish in recent years thanks to our flock of sheep likely also puts our total below average. On the negative side, sheep are themselves sources of methane, which likely mitigates some of the other positive contributions they make. I will be interested to learn the balance here when we get our formal audit. Does being carbon-negative outweigh the environmental impact of the flock's methane? I am less certain of this grade than any other in this list. Are we doing "A" work? Maybe! Is it actually a "C"? I hope not!
- Fuel production and combustion: D+ (Benchmark: 3; our use: 4) Although the sheep have allowed us to reduce tractor passes, organic farming still requires more tractor work than conventional chemical farming. We also use propane in the spring to power our frost fans, though we've been lucky that we haven't had many near-freezing spring nights in recent years. Our reduced tillage in recent years is a positive factor. But I'm guessing we're at or below average in this one category compared to the average California winery. Luckily, it's a small factor overall.
- Electricity consumption: A (Benchmark: 4; our use: 0) About the only use of electricity in the vineyard is to power our well pumps. Given that we irrigate minimally compared to most wineries and that more than a third of our vineyard is dry-farmed, I'm guessing our power draws are well below average. But, most importantly, we expect that the installation of our fourth bank of solar panels last month will get us to 100% solar powered. So, this (and our winery power needs) should be near zero.
- Raw materials production: A (Benchmark: 10; our use: 0) Because we've been farming organically since our inception, our carbon footprint for the production and transport of materials like fertilizer and pesticides has always been low. What's more, we have been working to eliminate one outside input after another in recent years. Our sheep have allowed us to eliminate even the application of organic fertilizers or outside compost. Our cultivation of beneficial insect habitat has reduced our need to intervene against pests to near zero. We've even been producing our own Biodynamic preps on site. I think we've basically eliminated this category of carbon input at Tablas Creek.
In the Winery: Overall Grade A (Benchmark: 15; Our use: 2; Savings: 87% vs. benchmark)
- Fuel production and consumption: A (Benchmark: 7; our use: 1) We've moved entirely to electric-powered forklifts in the winery, which means they're fueled by our solar array. Same with our refrigeration. Really the only fuel we're using in production now is the transport of grapes to the vineyard, and with our estate vineyards located at the winery and our purchased grapes representing only about 30% of our production, I figure that our use of fuel is 80%-90% less than the California average.
- Electricity consumption: A (Benchmark: 7; our use: 0) The fourth bank of solar panels here, as in the vineyard, should reduce this to zero this year. I've said for a long time that if there is a natural resource that Paso Robles has in abundance, it's sun. This feels like an area in which every winery should be investing; there are good tax credits available to help with the up-front costs, and the return on the investment even without them is in the 15-year range.
- Other winery: C+ (Benchmark: 1; our use: 1) The CSWA footnote lists "transport of grapes from the vineyard to the winery, raw material production, refrigerant losses, and manufacturing waste treatment" in this category. We don't use much in the way of raw materials compared to the average winery (no yeasts, nutrients, etc., very few new barrels, no chemicals or additives). And our winery wastewater treatment is done using a wetland area that likely has positive carbon offsets from the water plants compared to an average winery wastewater facility. But I'm sure we have some refrigerant losses.
In our Packaging: Overall Grade B+ (Benchmark: 38; Our use: 25; Savings: 34% vs. benchmark)
- Glass bottle: A-. (Benchmark: 29; our use: 17) I wrote a few years back about how our switch to lightweight bottles in 2009 saved more than 1.3 million pounds of glass in nine years. I'm proud of the analysis that led to that choice, and also of the aesthetics of the bottle that we chose. And bottles make an enormous difference. In the CSWA's analysis, they published a graph (below) showing that the switch to a lightweight bottle would save 10% on a winery's overall carbon footprint, all by itself. That is because glass bottles are energy-intensive to produce and add significant weight to the product, which increase transportation costs later. Our bottles are also produced in America, at a factory outside Seattle. Given how many bottles are produced either in Europe, China, or Mexico, with the added costs of transport to California, I feel good about this. I also give us a little bump in our grade for this metric because we have for the last decade been selling a significant percentage (roughly a quarter most years until 2020) of our Patelin de Tablas in reusable stainless steel kegs, which Free Flow Wines (our kegging partner) estimates results in a 96% reduction in that package's CO2 footprint. So why don't we get an "A"? Even though our bottles are quite light, there are now even lighter bottles available than our 465 gram bottle. And we don't use the bag-in-box 3 liter package (the best available package, in terms of CO2 footprint) at all. I'm investigating that more seriously, although a move to that format would come with some significant challenges... not least that we'd be a wild outlier in terms of price; even our Patelin de Tablas would be double the price of the most expensive 3L bag-in-box at our local supermarket. But still, while there is more to do, I feel good about how we score in this, the most impactful of categories.
- Corrugate case box: B- (Benchmark: 6; our use: 5) We do use corrugated cardboard case boxes, and haven't really dug into this as a potential source of savings. We do, however, use entirely 12-bottle case boxes, unlike many higher-end wineries. There were a few years in the late 2000s where we switched our Esprit de Tablas tier of wines into 6-bottle cases, which essentially doubles the amount of cardboard needed per bottle. We made the decision back in 2012 to go back to all 12-bottle cases, and I'm happy we did.
- Other packaging: C+ (Benchmark: 3; our use: 3) We don't do anything particularly unusual with other packaging. We use labels, capsules, and either corks or screwcaps. Our ratio of corks to screwcaps is probably about the industry average. At least we aren't using any synthetic corks, made from plastic in a manufacturing process. I feel like we can find some savings here with a little harder look.
Transport of Bottled Wine: Overall Grade D+ (Benchmark: 13; Our use: 16; Extra footprint: 23% of benchmark)
- Transport of bottled wine: D+ (Benchmark: 13; our use: 16) I wish that the CSWA had broken this out in more detail. On the one hand, our lighter bottles give us savings here. On the other hand, the 65% of our production that we sell direct-to-consumer (DTC) means that a higher percentage of our wine than the industry average is shipped via UPS and FedEx. Those DTC shipments require extra cardboard in the form of sturdy pulp shippers, and are in many cases being shipped via air rather than ground. We don't feel we have a choice here given that wine is perishable and fragile, and it needs to get to our customers in good condition. But I worry about the environmental costs. We have started, for our wine club shipments, sending the wine that will go to customers east of the Rockies via truck to staging warehouses in Missouri and New York, from where they can be packed into shipping boxes and shipped ground. But that hasn't proven feasible for our daily shipping. I do give us some credit for eliminating styrofoam packaging more than fifteen years ago, but I think it's likely that any winery that sells two-thirds of their production direct is going to have an above-average carbon footprint from wine transport given that DTC sales made up just 10% of total sales of California wine pre-pandemic.
Adding up my back-of-the-envelope assessments leads to a total footprint estimate of 60% of the baseline (18+1+25+16). Our lighter bottles and solar arrays account for most of that improvement.2 That's pretty good, but it's clear that we have additional work that we can be doing across our business. My biggest questions, which I hope that our audit will help answer, revolve around whether we can sequester enough carbon with better viticulture to offset a significant amount of what happens after the wine gets bottled. If we're going to get our carbon footprint really low, can we do that with our own property? Or have we made most of the improvements we can already, and will we need to look toward offsetting the carbon in a different way?
I don't know the answer to this yet, but I'm committed to finding out.
Final Grade: B+/A- (Benchmark: 100; Our use: 60; Savings: 40% vs. benchmark)
- It is important to recognize that carbon footprint is just one measurement of care of the environment. Others, which I feel we do well on, include fostering of plant, animal, insect and microbial biodiversity; reduction of non-biodegradable waste; protection of habitat; and elimination of chemicals and toxins.
- If I were a winery starting fresh at looking at my carbon footprint, installing solar arrays and reducing the weight of my bottles would absolutely be my first avenues of attack. Both offer immediate returns on investment both environmentally and financially.