The US has vowed to cut its carbon emissions in half by the end of this decade, as President Joe Biden promised the new targets would help create jobs and maintain American competitiveness.
美國發誓到2030年將碳排放減少一半，美國總統喬?拜登(Joe Biden)承諾這一新目標將有助于創造就業機會和保持美國的競爭力。
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