美国有线新闻 CNN 拜登承诺到2030年将美国的温室气体排放量减少50%（在线收听）

April 22nd was Earth Day and that was when the White House kicked off a virtual Climate Summit, an online meeting of dozens of world leaders.

4月22日是地球日，白宫在这天召开了一个虚拟气候峰会，数十位世界领导人出席了这场线上会议。

U.S. President Joe Biden promised that America would dramatically reduce its greenhouse gas emissions. These include carbon dioxide, methane and nitrous oxide.

美国总统乔·拜登承诺，美国将大幅减少温室气体排放。这包括二氧化碳、甲烷和一氧化二氮。

Most climate scientists blame these gases for polluting the atmosphere and negatively impacting the global climate.

大多数气候科学家指责这些气体污染了大气，并对全球气候造成了负面影响。

By the year 2030, President Biden wants to cut America's emissions of greenhouse gases by at least 50 percent over what they were in 2005.

拜登总统希望，到2030年，美国的温室气体排放量比2005年至少减少50%。

That's one of the most ambitious pledges in the world but there are no penalties if the U.S. doesn't meet that commitment

这是世界上最雄心勃勃的承诺之一，但如果美国不履行这一承诺，也不会受到惩罚，

and the Biden Administration did not give details on how American would meet it.

而且拜登政府没有透露美国计划如何履行承诺的细节。

The U.S. hopes that having a high target in reducing greenhouse gas emissions will give it leverage in convincing other countries to do the same thing.

美国希望，在减少温室气体排放方面设定一个高目标，这将有助于说服其他国家采取同样的行动。

The president said that no single nation can confront climate related issues on its own

总统表示，没有一个国家能够独自面对气候问题，

and he called on the other leaders in the summit, who included Chinese President Xi Jinping and Russian President Vladimir Putin,

他呼吁峰会上的其他领导人，包括中国国家主席习近平和俄罗斯总统弗拉基米尔·普京，

to take action in their own countries to reduce greenhouse gas emissions.

在各自国家采取行动以减少温室气体排放。

But while the U.S. leader says doing this offers an extraordinary opportunity to create jobs in the green energy sector,

但是，虽然这名美国领导人表示，这样做为绿色能源领域创造就业机会提供了一个非同寻常的机会，

critics say the president's policies have caused thousands of job losses in the oil, gas and coal industries.

但批评人士表示，总统的政策已在石油、天然气和煤炭行业导致数千人失业。

Former President Donald Trump rolled back U.S. government regulations concerning greenhouse gas emissions.

美国前总统唐纳德·特朗普撤销了美国政府有关温室气体排放的法规。

His predecessor, Former President Barack Obama had instituted new regulations.

特朗普的前任，即前总统巴拉克·奥巴马制定了新的法规。

So American policies on this can change from president to president.

因此，美国在气候方面的政策可能会随着总统的更迭而改变。

The virtual Climate Summit runs through Friday.

虚拟气候峰会将持续到周五。