Climate activism was prominent with Greta Thunberg and others. In 2021, the UN Climate Change Conference (COP26) took place in November, which might have influenced teen girls' activism.
Potential sources for data: CDC reports on teen mental health from 2021, Pew Research on social media usage, fashion industry reports on trends. index of teen girl 2021
Need to make sure information is accurate to 2021 and not mixing with later years. For instance, the Delta variant was a big issue in 2021, affecting school reopenings and outdoor activities. Climate activism was prominent with Greta Thunberg and
I should also consider the tone. The user wants a "piece," which could be a general article. The example used a conversational yet informative tone. I should maintain that, perhaps with some statistics or quotes if possible, but since this is a general index, maybe just summarizing key points. Need to make sure information is accurate to
Also, the Metaverse and NFTs were emerging concepts in 2021. How did teen girls engage with these? Maybe in fashion, virtual try-ons, or attending virtual concerts.