Nowadays scientists are finding light pollution can be almost as bad as carbon dioxide pollution.

如今科学家们发现光污染几乎和二氧化碳污染一样有害。

youdao

A laborious study of the girth of 70, 000 trees across Africa has shown that tropical forests are soaking up more carbon dioxide pollution that anybody realised.

一项费力测量了整个非洲大陆上近7万棵树木周长的研究显示，热带森林吸收的碳排放比我们认识到的要多。

youdao

"Carbon dioxide: they call it pollution; we call it life," runs the slogan.

广告的口号是：“二氧化碳：他们把它称为污染；我们把它叫做生活。”

youdao

A carbon footprint is the amount of carbon dioxide pollution that we produce as a result of our activities.

VOA: special.2011.04.05

Other threats include human pollution, acidification from carbon dioxide and rising temperatures in Earth's atmosphere.

VOA: special.2009.05.12

And the world carbon dioxide pollution levels are accelerating yearly.

NPR: Experts: CO2 Record Illustrates 'Scary' Trend

Speedier development is important because most of GM's engines and transmissions will have to be new within the next few years due to stricter government carbon dioxide pollution and fuel economy regulations, Winegarden said.

WSJ: GM to invest $200M in Pontiac powertrain center

Governments are solidly behind the new vehicles, which they see as essential for bringing down carbon-dioxide emissions and reducing pollution in cities.

ECONOMIST: Electric cars