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树木为消除污染物的好帮手，但生长需时及需空间，还要面临被森林砍伐的危机。墨西哥有初创企业近日发明一棵人工树，一棵所吸收的空气污染物，等同368棵真树所吸收的，有望可改善城市的空气。

人工树“BioUrban”高4.2米、阔3米，拥有后现代的外形，以微藻类吸收空气中的二氧化碳及污染物，并转化成纯氧释回空中。

初创企业BiomiTech的创办人费雷尔指：“系统透过科技，吸入污染物并利用生物学进行自然过程（光合作用），就像真的树一样。”每一棵人工树等同一公顷森林可清洁的空气，亦等于2890人每日需吸收的空气。

世界卫生组织（WHO）的数据估计，每年有700万人因空气污染而亡。费雷尔决心不再就手旁观，指企业的目标是在没法种树的情况下，帮助城市追求更清洁的空气。报道指，每棵人工树的造价为5万美元（近21万令吉），主要售予当地政府；目前公司已“栽种”了3棵，分别在墨西哥、哥伦比亚及巴拿马。

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