Imagine That You Are at Dinner with a Group of Friends

Imagine that you are at dinner with a group of friends. The topic of climate change comes up, and one of your friends insists that climate change is a myth. What evidence would you provide to convince your friend that climate change is actually occurring, and that humans play a role in this process?

A) That an increase in CO₂ levels first occurred during the 1940s, coinciding with the events of World War II.
B) That the world's oceans have become more acidic, the direct result of excess human-produced CO₂ being released into the environment.
C) That the mean temperature of the world's oceans has increased, while the mean surface temperature of Earth has remained constant over the last several decades.
D) All of these choices are correct.