Final answer:
Michael Kremer found it to be true that world growth rates have increased with rising world population. This multifaceted growth is attributed to several factors, including technological advancements and a decrease in mortality rates, rather than solely to new births. As of the last count, the world population was over 7.6 billion.
Step-by-step explanation:
Michael Kremer's research concluded that world growth rates have increased as the world population has grown. This can be considered true. The understanding that the human population has grown exponentially is supported by historical and sociological research, while the statement could also relate to the discovery that improved productivity and technological advancements have contributed to increased growth rates alongside rising population numbers.
Factors contributing to population growth are not limited to new births but include others like the decline in mortality rates, advancements in medical technology, and improvements in living standards which allow populations to grow and sustain larger numbers. Therefore, it cannot be concluded that new births were solely responsible for the increase in population size.
Some countries do indeed have a negative growth rate. Data on birth rates, death rates, immigration, and emigration are key to understanding these differences in population trends.
The current world population exceeds 7.6 billion, and as of the information available at the knowledge cutoff, the answer would be closest to 'Around 7 billion.'