First documented in June 2015 on Twitter. Currently active and in regular use across social platforms since 2015.
Vegetation on rooftops: stormwater management, insulation, urban heat island reduction, habitat. Chicago City Hall (2001) pioneer. Germany mandates widespread. High costs, maintenance, waterproofing challenges. Instagram garden rooftops. Toronto bylaw requiring green roofs 2009.
Sources: Academic urban planning journals, city planning documents, ArchDaily, The Urbanist, Strong Towns blog, CNU publications.
Carlos Moreno's concept: all daily needs within 15-min walk/bike
#350ppm refers to 350 parts per million CO2—the safe upper limit for atmospheric carbon according to climate scientist James Hansen, becoming rallying number...
#50501 — for '50 protests, 50 states, one movement' — is the decentralised US pro-democracy protest movement that grew out of a late-January 2025 Reddit thre...
> Nightly applause for healthcare workers
TikTok choreography explosion
#AbolishIce is an activist hashtag advocating for social change and justice