Biodiversity and Extinction Assessment

The video discusses the ongoing biodiversity crisis, emphasizing that extinction rates are not declining. It highlights human impact on ecosystems, challenges in estimating extinction numbers, and various threats to species. The importance of biodiversity for human well-being is stressed, and potential solutions to address the crisis are explored.

Why is it challenging to confirm that a species has gone extinct?

• Species are often found in easily accessible areas.

• Extinct species are usually abundant.

• It takes time and effort to confirm extinction.

• Extinction is a rapid process.

What has been the impact of human population growth since 1970?

• Stabilized natural resources.

• Increased consumption and strain on ecosystems.

• Reduced human interference in nature.

• Decreased strain on ecosystems.

Why is the estimate of 900 extinct species since 1500 considered an underestimate?

• Extinction rates are declining.

• Most species have been named and documented.

• Extinction is easy to confirm.

• Many species are unnamed and difficult to track.

What is the role of the IUCN in assessing extinction risk?

• They focus only on mammals.

• They assess a wide range of taxonomic groups.

• They only assess plant species.

• They do not assess insects.

Why are insects considered an outlier in extinction assessments?

• They are less diverse than other species.

• They are not affected by human activities.

• They are too diverse to assess comprehensively.

• They have a higher fraction of threatened species.

What is the estimated total number of animal and plant species on Earth?

• 10 million

• 8.1 million

• 5 million

• 2 million

How does the fossil record affect our understanding of biodiversity?

• It may give a biased view of past biodiversity.

• It confirms that biodiversity is at its peak now.

• Older fossils are easier to find.

• It shows a clear increase in species diversity.

Why is biodiversity important for human well-being?

• Ecosystems provide essential services for humans.

• Humans do not rely on ecosystems.

• Biodiversity is only important for scientific research.

• Biodiversity has no impact on human life.

What analogy is used to describe the loss of species?

• Removing rivets from an airplane.

• Adding more species to an ecosystem.

• Building a stronger foundation.

• Constructing a new ecosystem.

What is required to prevent the biodiversity crisis?

• Focusing only on climate change.

• Maintaining the status quo.

• Transformative change across all sectors.

• Ignoring the problem.