A living wall biofilter is an active filter system that removes contaminants and volatile organic compounds (VOCs) from indoor air.

Green walls, designed so they are covered in vegetation, could help cut the amount of noise that enters buildings, a new study has found. In lab. tests, researchers found that a modular green wall system reduced sound levels by 15 decibels (dB). This leads them to believe that it is a promising sound reduction device that could improve quality-of-life for city residents.

Costs of installing, maintaining and disposing of some green wall systems may outweigh the value of some of their benefits for householders, a recent study suggests. While the researchers omitted some of the wider social benefits, they found that reductions in heating and air conditioning costs, longevity of green walls and increases in property values did not compensate for their costs. The researchers suggest that government incentives to lower set-up costs could significantly increase the walls' economic sustainability.

The Great Green Wall is rooted in Africa's Sahel region on the southern border of the Sahara. Once completed, it will be the largest living structure on Earth.

Desertification and land degradation affect the lives of around three billion people, according to UN estimates. Two ambitious projects aim at halting desertification and returning soil to productivity: the Great Green Wall project in northern Africa; and the Green Great Wall initiative in China.

We've heard of transformer apartments, but what about a transformer garden. These movable green walls create flexible outdoor spaces.

It's the first living painting in London's Trafalgar Square, and maybe the first anywhere. A Van Gogh picture has been turned into a green living vertical wall.

It also pushes the limit of what we mean by historic preservation.

Hawaiian engineers think that it can address many of the world's problems. Are they too ambitious?

It's been a couple of years since the still-planned and so-called Great Green Wall of Africa graced the pages of TreeHugger, so here's a quick update and overview: As the BBC reports, African leaders are meeting in Chad to further push the

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