Question

What really caused the sudden upsurge in concern for preserving america’s environment at the beginning of the twentieth century?

Answer 1

In the event of the climax of industrialization, it made an immense impact on the environment in the 20th century that made people call for change. From this event, the progressive movement emerged. 
The movement tried to solve the environmental concerns but also tried to improve social concerns of the different sectors such as housing, child welfare, and consumer rights.