shade balls

(名詞) 塑膠遮陽球。

註:2015 年 8 月間,洛杉磯市政府把近億顆 (9,600 萬顆) 黑色塑膠遮陽球倒入水庫來覆蓋水面,讓外界頗感好奇。原來這樣做的目的是為了防止水庫的水分蒸發、滋生水藻,同時保持水源不受鳥糞等的污染,就連太陽照射引發的化學變化也可以減輕。

據悉,洛杉磯曾發現當地飲用水有污染的疑慮,因為水中的溴化物含量高,這類物質常見於地下水中,溴化物若碰上為消毒而加入的氯並經過太陽照射後,就會轉變成疑似致癌物「溴酸鹽」。

引句:
Called shade balls, 80 million of the hollow black orbs are needed to cover the reservoirs in Los Angeles to stop sunlight from triggering a potentially dangerous chemical reaction between bromite, which occurs naturally in groundwater, and the chlorine used to disinfect drinking water.
—Catherine Kavanaugh, "Plastic balls protect California reservoirs," PlasticsNews, January 3, 2014

The EPA mandates that all reservoirs be covered, but because tarps can be expensive and metal coverings can take too long to install, shade balls — at least in Los Angeles — are becoming a preferred method.
—Laura Wagner, "LA Rolls Out Water-Saving 'Shade Balls'," NPR, August 11, 2015

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洛杉磯市政府把近億顆黑色塑膠遮陽球倒入水庫

(圖片來源:YouTube 影片截圖)

洛杉磯市政府把近億顆黑色塑膠遮陽球倒入水庫
(圖片來源:BloombergBusiness 網站)

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