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This is Scientific American's 60-second Science, I'm Steve Mirsky.
So you buy something made of plastic and it's labeled biodegradable.
You can rest easy knowing that after you throw it out it will harmlessly break down. Well, not so fast.
"When we look at biodegradability as it pertains to landfills, biodegradability is not a desirable attribute for a material.
And the reason for this is that when we design for biodegradability, we're typically designing for rapid biodegradability,
and yet landfills do not begin to collect the gas that's produced typically for two years...
so much of the gas, the methane, from biodegradability is released to the environment before gas collection systems are installed."
Morton Barlaz. He heads the Department of Civil, Construction and Environmental Engineering at North Carolina State University.
And he spoke June 6th on Capitol Hill at the third "Science on the Hill" event,
co-hosted by Scientific American and California Congressman Jerry McNerney.
The theme of this session: "Solving the Plastic Waste Problem."
"Now I just answered the question from a landfill perspective.
If I were to switch hats and say, well, is it desirable from a litter perspective, sure.
If it actually biodegrades and is converted to gas, then the litter would disappear, and that's desirable.
这里是科学美国人――60秒科学系列,我是史蒂夫・米尔斯基。
假如你买了一些塑料制品,上面标明“可生物降解”。
那你就可以放心了,因为你知道将它扔掉后它会无害降解。嗯,不要太快下结论。
“当我们从适合垃圾填埋场的特性这一角度考虑生物降解能力时,会发现它并不是理想的材料属性。
原因是,我们在设计生物降解能力时,通常会追求快速的生物降解,
然而垃圾填埋场尚未开始收集两年内产生的气体,
生物降解产生的如此多的甲烷气体,会在安装气体收集系统之前就被释放到环境中。”
莫顿・巴拉兹说到。他是北卡罗莱纳州立大学土木、建筑和环境工程系主任。
6月6日,他在国会山举行的第三届“国会山上的科学”活动上发表了讲话,
该活动由《科学美国人》和加州国会议员杰里・麦克纳尼共同主办。
本届会议的主题是“解决塑料垃圾问题”。
“刚才我只是从垃圾填埋场的角度来回答这个问题。
那如果我换个说法,从垃圾角度来看,生物降解可取吗?答案是肯定的。
如果垃圾真的能被生物降解并转化为气体,那垃圾就会消失,所以是可取的。
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