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The correct answer is option 1, which states that only statement 1 is correct.
Statement 1 states that the Living Planet Index (LPI), which measures the populations of various species, has declined by 52% since 1970. This means that there has been a significant decrease in the populations of mammals, birds, reptiles, amphibians, and fish over the past few decades.
Statement 2 is not mentioned in the question, so we cannot determine its correctness or incorrectness based on the information provided.
In summary, the Living Planet Report - 2014 by the World Wildlife Fund (WWF) reveals that the Living Planet Index has declined by 52% since 1970. However, we do not have any information about the most dramatic regional LPI decrease occurring in Africa.