根据后文“In America for example,every citizen produces about 28 tons of carbon dioxide and other dangerous gases a year;in Great Britain the amount is about 10 tons.”(例如,在美国,每个公民每年产生约28吨二氧化碳和其他危险气体;在英国,这个数字约为10吨。)可知,碳足迹通常以每年的二氧化碳吨数来...
_ 1 C __You can measure your carbon footprint by using a calculator that you can find on various websites. _2 B In Americ a for example, every citizen produces about 28 tons of carbon dioxide and other dangerous gases a year; in Great Britain the amount is about 10 tons.3 E The ...
Why is Carbon Monoxide Dangerous? When carbon monoxide is inhaled, it passes from the lungs into the hemoglobin moleculesof red blood cells. Carbon monoxide binds to hemoglobin at the same site as and preferentially to oxygen, forming carboxyhemoglobin. Carboxyhemoglobin interferes with the oxygen tr...
electricity, pour out carbon dioxide, which threatens to change Earth's climate in dangerous ways [source: Dosomething.org]. Energy vampires drain pocketbooks as well. In 2011, each American spent an average of $4,410 a year on energy [source: Clayton]. Putting a stake through the heart ...
So although inverse suspension can be dangerous, it's actually pretty rare that people die from it. Afraid of getting stuck upside down on a roller coaster? Well, it's not impossible. In 1997, a group of people found themselves in exactly that position for an hour and a half, and every...
In fact, the night is a dangerous time for the animal to sleep because some of their enemies look for food at night. However, deer try their best to sleep for three to four hours. Even when sleeping, they have to be careful so that they do not become food for their enemies. The ...
The UN said transportation is the third-largest source of carbon dioxide (CO2), a greenhouse gas that causes global warming. Choosing a bike over a car just once a day can cut down a person’s transportation carbon emissions by 67 percent, according to a University of Oxford study. ...
Are Carbon Emissions Dangerous? Source: iStock Carbon emissions are dangerous in that they threaten the livelihood of our planet, animals, humans, and ultimately, life as we know it. The amount of carbon emissions trapped in our atmosphere causes global warming, which causes climate change, sympt...
Many of the chemicals inside cigarettes can trigger dangerous mutations in the body's DNA that make cancers form.香烟里面许多的化学成分可以引发严重的基因突变，使癌症形成。Additionally, ingredients like arsenic and nickel may disrupt the process of DNA repair, thus compromising the body's ability to...
They also made it less dangerous by replacing supercritical alcohol with supercritical carbon dioxide in the drying process. These developments reduced the time spent drying the aerogels and reduced the hazardous and flammable nature of their production. Such advances made aerogel a bit more ...