Air quality
Oxygen re-generation
Ecological Engineering
Production of oxygen by plants is perhaps the most fundamental environmental service provided by vegetation.
![photo 45](/images/ecoeng_article_images/photo_45_.jpg)
Conventional Engineering
In the absence of plants, we would require artificial means to scrub CO2 from the atmosphere to maintain a liveable environment.
![photo 46 co2 scrubber](/images/ecoeng_article_images/photo_46__co2_scrubber.jpg)
economist.com