Aclimber pulls down on a rope causing his body to lift upward and rise up along the rope

Is he a window washer?

a climber pulls down on a rope causing his body to lift upward and rise up along the rope

Newtons 3rd Law

the answer is "by providing data about careers and annual mean wages"

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)