ment before it can begin trapping t

ment before it can begin trapping the millions of tons of carbon dioxide produced each year, Power
says. But a big concern has been overcome, he says. They ve shown it is possible to do this at room
temperature and pressure. Now the team can explore, how to make the process more efficient
12. Why do scientists try to make magnesite in labs?

A. To show how advanced their technology is
B. To help slow the speed of global warming
C. To create more new materials for mankind
D. To prevent carbon dioxide from being sent into the air
carbon dioxide are locked up in five kilos of magnesite?
13. How many kilos of
A 2 kilos
B. 5 kilos
D 2. 5 kilos
C. 3 kilos
14. What do we know about producing magnesite in labs?
A. It is easy to do
B. Its process is complex

C. It is energy consuming
D. It takes thousands of years
k 15. What can we infer from the last paragraph
A Using minerals to trap carbon dioxide has a long way to go.
B. Mass production of magnesite is on the way
C. Magnesite can' t be made at room temperature

D. Most scientists think little of this new method

D
Scientists have suggested trapping carbon dioxide in rocks as one way to slow the rate of climate
change. But they haven t come up with an easy way to do it until now, anyway. Researchers in Can-
da have just proposed a new technology to collect and trap the greenhouse gas
Limestone(Gk4) and other minerals already store a lot of carbon dioxide on the earth, notes
lan Power. He's a geoscientist at Trent University in Peterborough, Canada. The problem-this
t present, he explains
natural process is slow. It can take thousands or even millions of years. At
Were producing so much carbon dioxide now that the earth can't keep up
They found that a mineral called magnesite(E# W) locks up carbon dioxide. A ton of this
mineral can store about half a ton of carbon dioxide. The chemical normally takes thousands of years
to form. But in the lab, Power's group made it happen in just a few months
Magnesite occurs naturally. But the process by which it forms on the earth's surface is very
o scientists try to combine rocks and carbon dioxide using lots of heat in the
at
could make the mineral quickly -but there are a lot of problems to deal with to produce magnesite in
the lab as well as consuming a lot of costly energy
So far, the scientists have made only a tiny amount of magnesite in the lab. The total -one
icrogram- is about one millionth the weight of
e process nee
So the
ds a lot of improve
a paper clip.