Some data suggest that the average global
temperature will increase by 1°c–2°c by the
year 2050. if this occurs, a major concern for
humans would most likely be that
(1) sea levels might rise enough to flood some
coastal areas
(2) long-term stability of the climate will benefit
ecosystems
(3) the availability of salt water for agricultural
use will increase
(4) the threat of extinction of land organisms will
decrease