Answer:
The main contributors to the world's urbanization since 1970 have been countries like Algeria, whose population went from ______.
According to the graph, the share of the world's population living in cities has increased significantly since 1970. To find the main contributors to this urbanization, we can look for countries that experienced a large increase in their urban population.
One example is Algeria. In 1970, only about 40% of the population lived in cities. However, by 2015, the urban population had risen to approximately 75%. This indicates a substantial increase in urbanization in Algeria.
Another example is China. In 1970, around 20% of the population lived in cities. By 2015, this number had skyrocketed to over 55%. China's rapid urbanization has been a significant factor in the overall increase in the world's urban population.
It's important to note that while some countries like France and Japan were already heavily urbanized in 1970, their contribution to the overall increase in urbanization since then may not be as significant as countries like Algeria and China.
Therefore, based on the data from the graph, countries like Algeria have played a substantial role in the world's urbanization since 1970.