'..the "CityTree", a mobile installation which removes pollutants from the air, has been popping up in cities around the world, including Oslo, Paris, Brussels and Hong Kong.'<blockquote>'
(CNN) Air pollution is one of the world's invisible killers.
It causes seven million premature deaths a year, making it the largest single environmental health risk, according to the World Health Organization.
In urban areas, air quality is particularly problematic. More than 80% of people living in areas where pollution is monitored are exposed to air quality levels that exceed WHO limits. And given that by 2050 two thirds of the global population will be urban, cleaning up our cities' air is a matter of urgency.
One well-established way to reduce air pollutants is to plant trees, as their leaves catch and absorb harmful particulates.
But planting new trees is not always a viable option.
That's why the "CityTree", a mobile installation which removes pollutants from the air, has been popping up in cities around the world, including Oslo, Paris, Brussels and Hong Kong.
Moss is in the airEach CityTree is just under 4 meters tall, nearly 3 meters wide and 2.19 meters deep, available in two versions: with or without a bench. A display is included for information or advertising.
Berlin-based Green City Solutions claims its invention has the environmental benefit of up to 275 actual trees.
But the CityTree isn't, in fact, a tree at all -- it's a moss culture.
"Moss cultures have a much larger leaf surface area than any other plant. That means we can capture more pollutants," said Zhengliang Wu, co-founder of Green City Solutions.
..
So far, around 20 CityTrees have been successfully installed, with each costing about $25,000.
..
Wu also argued that the CityTree is just one piece of a larger puzzle.
"Our ultimate goal is to incorporate technology from the CityTree into existing buildings," he said.
"We dream of creating a climate infrastructure so we can regulate what kind of air and also what kind of temperature we have in a city." '
- By Chris Giles,
This 'tree' has the environmental benefits of a forest, June 8, 2017</blockquote>
Context<blockquote>
'..to Ban Internal Combustion Engines by 2030''..committed to 100 percent clean energy by the year 2050.''The future of shipping is, without a doubt, silent and emission free.'(Global Infrastructure Upgrade) - Mexico's former president: Global infrastructure needs an upgrade'Thorium reactor: cleaner, safer and sustainable nuclear energy within sight''..reductions in air pollution and lower costs .. moving to low-carbon electricity generation..'Crowdfunding Focus Fusion (since May 6, 2014) - 'Focus Fusion: Clean Energy For All'(Fusion Power) - LPP Focus Fusion 1; '..FF-1 results are right now far ahead..'June, 2017 - 'Renewable sources of energy have generated more electricity than coal and gas in Great Britain..'