This claim is true. The original source of this fact-check comes from the United Nations Environment Programme: a global organization that addresses environmental issues and promotes sustainability, which is a trustworthy source. The organization claims that fast fashion negatively affects the environment due to "polluting [of] the oceans, the wastewater, toxic dyes, and the exploitation of underpaid workers." Additionally, the Ellen Macarthur Foundation, a partner of the UNEP, estimates that a truckload of abandoned resources is dumped in landfill or destroyed every second, putting our environment at great risk.
Firstly, a researcher from Princeton University has explained the many ways in which the fast fashion industry is affecting the environment. It's stated that the industry uses up 3,000 liters of water to produce a single cotton shirt, and producing synthetic materials causes plastic microfibers to get in our oceans. Along with this, it is noted that viscose has been used as an alternative to cotton, but it has resulted in a larger amount of greenhouse gas emissions than actual cotton production (
https://psci.princeton.edu/tips/2020/7/20/the-impact-of-fast-fashion-on-the-environment).
Furthermore, an article uploaded by the U.S. Government Accountability Office states: "Decomposing textile waste releases greenhouse gases, like methane, that contribute to climate change." Recent research in 2024 has also shown that around 60% of textiles include microplastics. The author also makes the point that consumers tend to buy fast fashion products and toss them out once the trend is over, and going through that many clothes is simply unnecessary and incredibly damaging (
https://www.gao.gov/blog/fast-fashion-great-your-wallet-costly-planet).
In conclusion, the initial claim has been proved true from thorough research and statistics. There are, in fact, many steps we can take to combat this issue. One major step is something called "slow fashion". This involves advocating for manufacturing that respects both people and the environment, buying from secondhand sellers, and renting clothes (
https://earth.org/fast-fashions-detrimental-effect-on-the-environment/). All of this is important to understand in order to restore the damaged parts of our planet.