02. By 2050, the world’s urban population is expected to nearly double, making urbanization one of the twenty-first century’s most transformative trends. Populations, economic activities, social and cultural interactions, as well as environmental and humanitarian impacts are increasingly concentrated in cities, and this poses massive sustainability challenges in terms of housing, infrastructure, basic services, food security, health, education, decent jobs, safety and natural resources, among others
Media or #OpenData
With a hashtag per article, anyone can tag content relevant to the status and implementation of the article, and share it via social media as explained at #tags in support of easy information retrieval (video on YouTube).
If you publish a website or blog, you can also embed the Twitter timeline of a hashtag as explained at How to embed a #tag timeline in your website or blog? (Video on YouTube). There is a Twitter timeline embedded at #udhr19 - Freedom of opinion & expression; to seek & receive information.