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.
美国发誓到2030年将碳排放减少一半，美国总统乔•拜登(Joe Biden)承诺这一新目标将有助于创造就业机会和保持美国的竞争力。
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