Final answer:
The correct answer is raising the global average temperature to 2 ºC. Over the last 7,000 years, there has been a rise in the global average temperature. This is evident from various historical periods and recent trends indicating a significant increase in temperature in the past century.
Step-by-step explanation:
The correct answer is B. raising of global average temperature totaling 2ºC.
Over the last 7000 years, there has been a rise in the global average temperature, totaling 2 oC. This is evident from various historical periods such as the Medieval Climate Anomaly and the Little Ice Age, as well as recent trends indicating a significant increase in temperature in the past century.
For example, during the Medieval Climate Anomaly, which occurred between 900 and 1300 AD, slightly warmer weather conditions prevailed in many parts of the world, resulting in higher-than-average temperature changes.