■NPR是National Public Radio,即美国国家公共之声。节目以新闻及综述为主,是美国国内收听率最高的广播之声。

概述:It is known to all that the air pollution is detrimental to human health, but is there any benefits we can receive from these pollutants? Recently, researchers have discovered something that contravened our common sense.

Science magazine
"They can add nutrients, for example, to the oceans or to the land, but also while they were in the atmosphere, they changed the climate and so that also can impact how much carbon the land or the ocean can take up. So there's quite a few different ways that aerosols can interact." In an article published in Science magazine, she concludes that those effects add up to quite a bit, which means, at the moment, aerosols are not only helping reduce global warming by cooling the atmosphere, but they're helping reduce the amount of carbon dioxide that stays in the air once we emit it. That's good news for now, it means the planet isn't heating up quite as fast as it could be, but it's bad news looking down the road a little bit. That's because many aerosols make people sick, heart and lung disease, in particular. So some nations are now in the process of trying to rein them in. "As we clean up the aerosols, which we really wanna do for public health reasons, we're going to be, perhaps, causing ourselves more trouble in terms of the climate situation." This is not a brand new idea. For example, other research has found that, if we switch from coal to much cleaner natural gas, that might not do much to help with global warming because we'd also be reducing the pollutants in coal smoke that help offset warming.