The result will be many frictions as humans learn manners and tolerance. Intermarriages will make a kaleidoscope of skin colors. The elderly fraction of the population will increase greatly, and the absolute numbers of elderly still more dramatically. Among the elderly, women will outnumber men by as much as 2 to 1. New social arrangements among the elderly will arise.
Environment Now let's focus on the environment.
The continental shelf, especially off Asia, will be developed to provide food, energy and perhaps living space. Oceanic food sources will be largely domesticated. The capture of any remaining wild marine animals will be managed like deer hunting now. The tropical forests that survive the onslaught of population growth and economic exploitation between 1950 and 2050 will be preserved as educational and touristic curiosities, like the immensely popular John Muir Woods north of San Francisco. Today's simplified agricultural ecosystems will be replaced by managed ecosystems of high complexity.