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      發布時間: 2019/10/2 0:11:05 被閱覽數: 次 來源: 中國新聞網
      文字 〖 〗 )

      資料圖:沙子。中新社記者 呂品 攝 

      中新網9月24日電 據外媒24日報道,人類正以前所未有的速度消耗著地球資源,從水到原油,以及蜜蜂數量的急劇減少都令人擔憂。除此之外,還有這些資源也可能面臨枯竭:沙子減少、地表土流失、氦氣資源或將短缺,甚至連太空軌道都遭遇擁堵問題。 
        太空軌道擁堵 
        截至2019年,在太空圍繞地球旋轉的各種太空物體多達50萬個。在這50萬個太空物體中,只有2000個物體是有目的和功能的,例如,人們日常使用的通訊衛星、地球定位系統GPS等。 
        不少太空物體可能造成太空軌道擁堵,有的甚至會與正常運轉的通訊衛星相撞。不僅如此,隨著技術進步,人類每天還在向太空發射各種各樣的新物體,進一步擁堵有限的太空軌道空間。 
        但目前人類對這些太空物體以及它們所占據的太空軌道,還沒有一個有效的所謂“太空管控機制”,也沒有任何機制來清理所產生的太空垃圾。 
        沙子正在消失 
        據報道,沙子是人類從地球上挖掘最多的一種物質。根據聯合國的數據,人們正在以比其自然更新快得多的速度用完它。 
        沙子是建筑用途最廣的自然材料之一。此外,土地開墾、玻璃制造等都需要大量使用沙子。 
        然而,沙子要經過數千年的侵蝕才能形成。沙子的流失也威脅著脆弱的生態系統。對此,有人呼吁對沙子的使用和開采進行全球監測,對其形成規范,以保護沙子資源。 
        氦氣或將短缺 
        氦(Helium)是一種無色、無臭、無味的惰性單原子氣體,通常條件下不與其它元素和化合物產生化學反應,不易燃燒,非常安全。但因其在空氣中含量極其稀薄,產量少,生產成本高。 
        從地球深層開采出來的氦氣資源極其有限。據信,目前人類的氦氣儲量只剩幾十年了。預計,在大約30到50年內,氦氣將出現短缺。 
        屆時,不但供人們娛樂用的氣球將變少,有的醫學設備也會出現使用問題。 
        據介紹,氦可以幫助冷卻磁體,使磁共振成像掃描儀得以正常工作。這一儀器在診斷和治療癌癥、腦部疾病和脊椎等方面發揮著重要的作用。 
        地表土流失 
        地表土是指地球表面最上面的土壤層,植物和莊稼的營養主要靠地表土來提供。 
        據世界自然基金會估計,在過去150年,人類已經喪失了世界上一半的地表土。通常,自然界要花500年的時間,才能形成一英寸厚的地表土。 
        流失地表土的原因包括土壤侵蝕、過度農耕、森林砍伐以及全球變暖等。 
            當地時間2019年9月17日,美國阿拉斯加州加德納里附近的凍土帶。據報道,由于全球溫度升高,在阿拉斯加近85%的地方發現多年凍土開始融化。 
        儲量有限的磷 
        磷不但是人類DNA的重要組成部分,同時,它也是無法替代的農業肥料。 
        過去,磷肥可以隨著莊稼和動物糞便等廢料一同被還原于土壤,但現在則是跟隨著農作物被運往城市,最終被我們的污水處理系統沖到大海中而流失。 
        報道稱,如果以現在的方式來計算,人類大約在35到400年之間用完磷的儲量,之后可能就要挨餓了。

      編輯:秋痕

      俄培育出人造肉2023年前開售 每公斤約90人民幣
      中國科學家揭曉麻雀選食不同高粱分子機制

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