Option 1 -> The passage explicitly states that "humans have been gradually changing the atmosphere, mainly as a result of industrial pollution."
Option 2 -> Sound pollution is not mentioned anywhere in the passage as a cause of temperature rise.
Option 3 -> While industrial pollution affects air quality, the passage specifically identifies "industrial pollution" (not just air pollution) as the cause.
Option 4 -> Water pollution is not discussed in the passage in relation to rising temperatures.
Hence, Option 1: Industrial pollution -> The passage clearly states that scientists believe human activity through industrial pollution over the past two hundred years has been changing the atmosphere, creating a greenhouse effect that traps heat from the sun -> correct