What is the main idea of Paragraph 4?

(单选题)What is the dark side mentioned in the text? (单选题)What is the best title for the text? (单选题)Why was it hard to criticize the Vermeer forgeries after Wor (单选题)Why didn’t experts expect the forgeries to look like Vermeer (单选题)Why did the art dealer admit that he had forged paintings? (单选题)What do we learn about the Southern Ocean? (单选题)What happens when sea levels rise in the Antarctic? (单选题)What does the passage say about king penguins? (单选题)What do we learn from the findings of a separate study? (单选题)What will happen by 2100, according to a new study?