单选题 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.