A carbon capturing device, called Orca, began operating in Iceland in September. The machine was invented and made by a Swiss company called Climeworks. The name comes from the Icelandic word orka which means energy.

Orca can pull carbon dioxide out of the air and send it deep into the ground, where it is turned into stone. The device is made up of four sections which look like giant air conditioners stacked together. Each section contains 12 large fans that suck air from outside into steel compartments.

Inside, the air passes through a filter (过滤器) which gathers the carbon dioxide. It is then heated to a high temperature so the carbon dioxide can be collected from the filter. Then, the carbon dioxide is mixed with water and put deep in the ground into a type of rock called basalt. Basalt causes the carbon dioxide mixture to turn into stone after two or three years.

Orca is an experimental device. It was built to demonstrate that it is possible to permanently remove carbon dioxide from the atmosphere. It can remove 4, 000 metric tons of carbon dioxide from the air each year. That’s about the same amount as the emissions produced by 850 cars in a year. In order to remove enough carbon dioxide to make a big difference to global warming, much larger devices like Orca would have to be built in many countries around the world.

Some environmental activists say governments should spend more time and money on reducing the amount of greenhouse gas we produce each year, instead of investing in carbon capture methods. But others say that, in order for countries to meet their goal of net zero emissions by 2050, they will need to do both: reduce new emissions and remove the carbon dioxide already in the air.

Generally speaking, convenience and safety affect how we choose to pay for things. Environmental concerns do, too.

Each time you pull out a credit, use a phone’s wallet app or hand over cash, you take part in a system. Some parts of that system make things, like coins, bills or cards. Other parts move money between buyers, sellers, banks and others. Used cash, cards and equipment will be eventually disposed of (处理), as well. Each part of this system uses materials and energy. And all parts produce waste.

Now researchers are looking more closely at how “green” these payment systems are. They’re finding buyers can help cut some of the environmental costs, no matter how they pay.

To understand the full “cost” to society of money or any other system, researchers can perform what’s called a life-cycle assessment. It looks at all the environmental impacts of a product or process. It starts with mining, growing or making the raw materials. It includes what happens while something is in use. And it considers the final disposal or reuse of things.

Even though raw materials are the first step, in fact there are raw materials added in at every single step along the journey. For money, raw materials go into each step of something that is “made”. Fuels are the raw materials for energy to make products and transport them. More energy goes into using products. Recycling or disposal also requires energy, plus water, soil or other materials.

People don’t realize most of those steps, so they can’t judge if one form of payment is dirtier or more costly. And that’s a problem, researchers say. It’s also what has got some of them to show more about the costs of how we pay for our lifestyles.

A life-cycle assessment doesn’t tell you what to do. However, it gives you an informed basis for making a decision.

How much rubbish do you imagine a person will produce in his lifetime? It’s about 127,604 pounds of rubbish. However, Lauren Singer, who majored in environmental science at New York University, began working toward living a “Zero Waste” lifestyle while still studying at university and has been completely “waste-free” for the past two years, proving that a waste-free lifestyle is possible.

Lauren regularly writes about her experiences of a zero-waste life on her blog. Though she was determined to take a waste-free lifestyle, she admits that the past two years have been very difficult. However, she now feels that she is getting used to this kind of lifestyle. “I stopped buying packaged products and began bringing my own bags at the supermarket,” she explained, “I stopped buying new clothes and shopped for only secondhand things. As more and more time passes, I produce less and less.

Even though the journey is hard, Lauren’s zero-waste life is well worth the effort. She now saves a lot of money because she only buys what she needs rather than buy things blindly. She also eats fresh fruits and vegetables instead of packaged foods.

Today she has learned to make all of her own everyday eco-friendly products, such as toothpaste, shampoo, kitchen cleaner and so on in order to avoid creating unnecessary rubbish. She also founded her own waste-free company, the Simply Co., through which she sells her homemade products.

The 23-year-old girl has become an inspiration to many. And now she is busy giving talks on TV and accepting news reporters’ interviews about her zero-waste lifestyle.

Lead a waste-free lifestyle — We are the future of this planet!