The poor villagers of Yaluma in Southern Mexico now have an extra source of income. They are being paid to grow and develop forests by the    1    (organize) in charge of Formula One racing,    2    pumps 5,500 tons of carbon dioxide(CO₂)into the air every year.

Projects like this    3    (go) under the name of “carbon trading”. The basic idea is that governments and companies can buy the right to pump CO₂ into the air by investing in green projects. They can buy so-called “carbon credits” from countries with CO₂ emissions(排放物)successfully    4    (reduce).

Supporters of carbon trading say that it provides a new way of doing business and brings money and green technology    5    poorer countries. while opponents(反对者)argue that nature comes before lifestyle. CO₂ emissions need to be reduced, not bought and sold. People should not help the rich countries keep a lifestyle    6    (depend) on pollution.

It is believed that modern    7    (life) are about choice. We can choose to take the danger of global warming seriously. And    8    sooner we choose to do it, the more choices we have about what    9    (do) next and the more time we have to do it in. We can also choose to pay no attention to the danger of global warming to keep    10    (we) lifestyles. Then one day nature may give us no choice at all.