第一篇:英語演講稿3分鐘
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為什么樹木對整個生態(tài)環(huán)境都如此重要呢?首先,樹木是小動物們的家園。當(dāng)我們砍伐樹木時,我們不僅僅毀掉了它們的家,也毀掉了自己的。一步步的,我們慢慢分解了整個生態(tài)鏈,所造成的結(jié)果就是大批的動植物種類滅絕。其二,砍伐樹木在某種程度上造成全球變暖。生態(tài)學(xué)家把森林比作人類的肺。森林能夠吸收二氧化碳和其他引起氣候變暖的溫室氣體,然后轉(zhuǎn)化成氧氣供地球上的生物呼吸。樹木不僅能凈化空氣,也能減少噪音。如果空氣質(zhì)量下降,那么人們就有可能死于肺癌,或者是其他致命菌。森林在預(yù)防疾病的過程中起到了重要的角色。氣溫的上升導(dǎo)致北極的冰層融化,水平面上升。也就是說,臨海的城市也許會被海水淹沒。但是森林就能夠阻止水土流失,使氣溫下降。它是保證全球生態(tài)平衡的關(guān)鍵。
有時候人們只關(guān)心掙錢,卻對我們所付出的代價不管不問。當(dāng)災(zāi)難來臨時,我們會害怕、會彷徨。我們賴以生存的地球,卻突然變成了威脅我們生命的東西。我們只希望,在這個人口過度、工業(yè)過度的星球能繼續(xù)撐下去。也許,是時候我們應(yīng)該保護地球,停止盲目瘋狂地砍伐樹木了。
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