You must already be aware of ‘carbon footprint.’ And like the rest of us, you are probably eager to reduce it. Step one: Swap your existing clothes with ones whose greenhouse gas emissions are low. GHG emissions are the basis of the assessment of carbon footprint. Why? We have to fight these numbers together. You might think GHG emissions of cotton are low and you only use organic cotton so this doesn’t concern you. But there are much better alternatives out there. Start small. Start with becoming an informed customer. Why did I write this article? This article is meant to tell you that there are alternatives. You don’t have to shop at Zara and H&M. I have broken down the greenhouse gas emissions stage by stage for every textile and found that hemp is the best textile you can purchase. Regarding GHG, hemp wins the race even leaving organic cotton behind. There are six different types of gasses present in the atmosphere giving a significant impact on the greenhouse effect: • Carbon dioxide (CO2) • Methane (CH4) • Nitrous oxide (N2O) • Hydrofluorocarbons (HFCs) • Perfluorocarbons (PFCs) • Sulfur hexafluoride (SF6) Because of the data available, I have mainly focused on CO2 emissions. CO2 emissions happen during different stages of production – preparation, planting, field operations (weed control, mechanical irrigation, pest control, and fertilisers), harvesting, and yields. And when you are calculating the CO2 emissions of the shirt that you are wearing, you also have to factor in the mode of transportation that was used to deliver the shirt to you. Here are the CO2 emissions of the most commonly used fabrics. Source GHG emissions of cotton in each phase of production Let’s start with one of the most common textiles, cotton. Cotton is mixed into almost every garment that we use. As per CO2 everything, 2 square meters of Cotton is equivalent to 8.3kg CO2e Here is the data for the spun fibre from studies carried out by the Stockholm Environment Institute on behalf of the BioRegional Development Group. A kilogram of CO2 Emissions per Ton of Spun Fiber Crop Cultivation Fiber Production Total Cotton, conventional (USA) 4.20 1.70 5.90 Cotton, organic (USA) 0.90 1.45 2.35 Cotton, organic (India) 2.00 1.80 3.80 Cotton farming system This stage includes GHG emissions of cotton from transportation of farm inputs (farm machinery, agrochemicals, and fertilizers), production, packing and storage, production, extraction, and use of electricity for irrigation, and N2O emissions from soils due to N-fertilizer usage. This table represents data from one irrigated system and other dryland farming systems in Queensland, Australia. Dryland double skip 1376 kg CO2e/ha Dryland solid plant 1376 kg CO2e/ha Irrigated cotton farming 4841kg CO2e/ha Textile finishing CO2 emissions are caused directly by the energy consumers and indirectly by the consumables such as lubricants and chemicals. This table provides details of energy consumption in the cotton or cotton blend finishing process. Notice how the source of energy affects CO2 emissions. The Garment phase The highest CO2 emissions happen when the textile becomes your T-shirt, pants etc. Here is the garment life cycle GHG emissions of your cotton T-shirt. This graph shows how your T-shirt emits GHGs throughout its life from becoming fibre till its disposal. Source Here are other significant figures. Source Now that we have understood the GHG emissions of cotton in detail. Let’s look at other fabrics in comparison. I use cotton as a base because cotton, especially organic cotton, is understood as less evil as compared to other textiles. The aim of this article is to tell you that you can do better than cotton which is allegedly a safe textile. Fiber Type Energy Consumption kW h/kg Fiber CO2 Emissions in kg/kg Fiber Nylon 69 37 Acrylic 49 26 Polyester 35 19 Polypropylene 32 17 Viscose 28 15 Cotton 15 8 Wool 13 7 Hemp 5 3 Getting the breakdown of each textile at every stage of production is hard and requires extensive research. Most research is focused on the CO2 emissions per kg fibre. If we have learnt anything from the cotton case study, it’s that GHG emissions don’t end at the production of fibre, rather they can go on even after the garment has been disposed of. Let’s look at Wool and Hemp, two alternatives that have lower emissions than cotton. Wool’s GHG emissions As per the data given above, the CO2 emissions of wool are lower. However, as per CO2 everything, 2 square meters of Wool fabric is equivalent to 13.89kg CO2e. The difference could be because of the different methods used to study, the process after the production of fibre and more. Let’s look at a study that was conducted in the Yass Region, New South Wales. The study found a total of 24.9 kg CO2-e per kg of greasy wool at the farm gate. The yield was 65.32 t per annum. Hemp – the carbon-negative alternative The fibre with the lowest CO2 emissions on the table was hemp. Let’s look into more detail. This data shows that 1 acre of hemp absorbs 10 tons of CO2. This means that hemp is actually carbon negative. This means that hemp actually absorbs CO2 while it grows. Source Just one hectare of hemp offsets a year’s carbon from two cars. In fact, it has been scientifically proven that hemp absorbs more CO2 per hectare than any forest or commercial crop and is therefore the ideal carbon sink. However, the good natural properties of hemp can be negated by the production methods. After hemp is grown, there is a long process that covers it into garments. To make sure that you purchase hemp garments with low GHG emissions, you have to ensure that the garments are sustainably produced. Natural farming is one such instance of preserving the goodness of hemp. Hemp foundation follows an ecological farming approach that emulates nature. How does this reduce GHG emissions? Converting the hemp plant into fabric is a four-step process: cultivate hemp, break it down, extract […]
