The Great Global Warming Debate: Part 2

The video explores the debate on global warming, discussing natural climate cycles and historical warming periods like the Medieval Warm Period. It highlights the need for direct evidence of historical temperatures, as instrumental records are limited. Climate proxies, such as tree rings and ice layers, are used to estimate past temperatures. Michael Mann's hockey stick graph shows a temperature rise in the 20th century, but skeptics question its accuracy and representation of the Medieval Warm Period. Despite limitations, all graphs agree that the late 20th century was the warmest in the past millennium.

What historical evidence suggests that the current warming trend might not be unusual?

• The Roman Warm Period

• The Medieval Warm Period

• The Little Ice Age

• The Industrial Revolution

What are climate proxies used for?

• Measuring current global temperatures

• Estimating historical temperatures

• Predicting future climate changes

• Recording daily weather patterns

Who is known for creating the hockey stick graph?

• Charles Keeling

• Al Gore

• Michael Mann

• James Hansen

Why do some skeptics question the accuracy of the hockey stick graph?

• It shows a decline in temperatures

• It only uses data from the last 50 years

• It doesn't include the Medieval Warm Period

• It was created using computer models

What is the consensus about the temperature in the last half of the 20th century?

• It was the coldest in recorded history

• It was similar to the Medieval Warm Period

• It was the warmest in the last 1000 years

• It was cooler than the previous centuries