Fashion accounts for around 10% of greenhouse gas emissions from human activity, but there are ways to reduce the impact your wardrobe has on the climate. The UN estimates that a single pair of jeans requires a kilogram of cotton. And because cotton tends to be grown in dry environments, producing this kilo requires about 7,500–10,000 litres of water. That’s about 10 years’ worth of drinking water for one person.

There are ways to make denim less resource-intensive, but in general, jeans composed of material that is as close to the natural state of cotton as possible use less water and hazardous treatments to produce. This means less bleaching, less sandblasting, and less pre-washing.

Jeans manufacturer Levi Strauss estimates that a pair of its iconic 501 jeans will produce the equivalent of 33.4kg of carbon dioxide equivalent across its entire lifespan – about the same as driving 69 miles in the average US car. Just over a third of those emissions come from the fibre and fabric production, while another 8% is from cutting, sewing and finishing the jeans. Packaging, transport and retail accounts for 16% of the emissions while the remaining 40% is from consumer use – mainly from washing the jeans – and disposal in landfill.

Another study of jeans made in India that contained 2% elastane showed that producing the fibres and denim fabric released 7kg more carbon than those in Levi’s analysis. It suggests that choosing raw denim products will have less impact on the climate. Around 70 million barrels of oil a year are used to make polyester fibres in our clothes. From waterproof jackets to delicate scarves, it’s extremely hard to get away from the stuff. Part of this stems from the convenience – polyester is easy to clean and durable. It is also lightweight and inexpensive.

But a shirt made from polyester has double the carbon footprint compared to one made from cotton. A polyester shirt produces the equivalent of 5.5kg of carbon dioxide compared to 2.1kg from a cotton shirt.
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