What two factors determine the density of water in deep currents?

There are two main factors that makeocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water.Ocean water gets more dense as temperature goes down. So, the colder the water, the more dense it is. Increasing salinity also increases thedensity of sea water.

causes

fossil fuels burn

cities become more industrialized

human population grows worldwide