单项选择题

Right now, the climate scientists feel that if all humans shut off carbon emissions today, it will still glide up by about 1 degree centigrade: In the business, as-usual scenarios, Nicholas Stem says there’s a 50 percent chance we may go to 5 degrees centigrade. We know what the Earth was like 5 or 6 degrees centigrade colder. That was called the Ice Ages. Imagine a world 5 degrees warmer. The desert lines would be dramatically changed. The West is projected to be in drought conditions. And certain tipping points might be triggered. We can adapt to 1 or 2 degrees. More than that, there is no adaptation strategy.
What would happen if the temperature went five degrees up

A. We would return to the Ice Ages.
B. There would be more humid areas.
C. The climate would be ary in the West.
D. We would adapt to the new climate well.