Do people in Bangladesh walk around carrying a heavy lead-acid battery and a fan?
It is a fan for a car so I assumed it is used to blow around the hot air in a car that is stuck in traffic.
Global Warming?? I live in Canada, not in a hot desert. We heat our homes and cars in winter and we cool them with air conditioning in summer because we are civilized. Some poor countries do not have heating, cooling, food or housing.
Opening a car window when it is moving and it is hot outside simply blows around hot air and lets out the air that was cooled by the air-conditioner.
EDIT:
Maybe they carry a fan and open the car window to blow away their bad smell. When I go shopping and see people who "look different" then I hold my breath when they go past because they stink.