Context: From 1950 to 2011, world population increased from 2.5 billion to 7 billion and is forecast to reach a plateau of more than 9 billion during the 21st century. Sir David King, former chief scientific adviser to the UK government, told a parliamentary inquiry: "It is self-evident that the massive growth in the human population through the 20th century has had more impact on biodiversity than any other single factor." At least until the middle of the 21st century, worldwide losses of pristine biodiverse land will probably depend much on the worldwide human birth rate.

Question: What was the increase in population from 1950 to 2011?
Answer: world population increased from 2.5 billion to 7 billion

Question: What year started the increase of population to 7 billion?
Answer: From 1950

Question: What is the forecast plateau that the population will reach during the 21st century?
Answer: more than 9 billion

Question: Who is the former chief scientific adviser to the UK government?
Answer: Sir David King

Question: What was the increase in population from 1957 to 2011?
Answer: Unanswerable

Question: What year started the increase of population to 2 billion?
Answer: Unanswerable

Question: What is the forecast plateau that the population will reach during the 22nd century?
Answer: Unanswerable

Question: Who is the former chief scientific parliamentary to the UK government?
Answer: Unanswerable

Question: Until at least when will worldwide loss of scientific advisers probably depend much on the worldwide birth rate?
Answer: Unanswerable