Section: Evidence-Based Reading

82) View Additional Information

In the ninth paragraph, which of the following is true, according to the author, regarding the Pacific Decadal Oscillation?

1. It's a one time occurrence
2. It's a recurring natural phenomenon of no concern
3. It steadily increases temperature over time, but not to concerning degrees
4. It changes temperatures over time and is characterized by positive and negative phases where temperatures increase, then slow down.