Large tanks of green algae, known as “liquid trees,” are gaining attention as a potential solution to air pollution in cities. These tanks, developed by scientists from the University of Belgrade, use microalgae to convert carbon dioxide into oxygen through photosynthesis. The microalgae are more efficient than trees at removing CO2 from the atmosphere. However, there is a debate on social media about whether liquid trees can truly replace the benefits provided by real trees. The tanks are intended to be a supplement in areas with poor air quality and limited space for planting trees. They are designed to be multifunctional, providing seating, solar-powered lighting, and charging ports. The liquid trees have been recognized as an innovative and climate-smart solution by the United Nations Development Programme.
| Signal | Change | 10y horizon | Driving force |
|---|---|---|---|
| “Liquid Trees” | Alternative to trees in urban areas | More widespread use of algae tanks | Air pollution and limited space for trees |
| Algae tanks viral on Twitter | Online debate | Increased awareness and discussion | Social media and viral content |
| Algae tanks developed in Serbia | Urban photo-bioreactor for CO2 removal | Adoption of algae tanks in more cities | Environmental concerns and pollution levels |
| Algae tanks more efficient | Faster CO2 removal than trees | Increased use of algae for pollution control | Environmental efficiency and effectiveness |
| Algae tanks not well-received | Concerns about replacing trees | Continued debate on the role of algae tanks | Public perception and attachment to trees |
| Algae tanks supplement for cities | Space-efficient solution for bad air | Integration of algae tanks in urban areas | Limited space for tree planting |
| Algae more resilient than trees | Can grow in polluted conditions | Preference for algae in highly polluted areas | Adaptation to challenging urban environments |
| Algae tanks multifunctional | Provide seating, lighting, charging | Integration of algae tanks in urban design | Innovation and smart city initiatives |
| Algae tanks recognized by UNDP | Climate-smart solution for urban areas | Increased support for algae tank projects | Climate change mitigation and sustainability |
| Concerns about drinking liquid trees | Humorous comments about consuming algae | Continued jokes and memes about liquid trees | Internet humor and culture |