In 2015, for example, scientists said that an ongoing drought in Californiaâthe stateâs worst water shortage in 1,200 yearsâhad been intensified by 15 percent to 20 percent by global warming. They also said the odds of similar droughts happening in the future had roughly doubled over the past century.
Definition: Birth rate is the demographic measure of the rate at which children are born. The most well known is the crude birth rate, which is the number of births that occur each year per 1,000 people in the midyear population. It is called âcrudeâ because it does not take into account the possible effects of age structure.
United States birth rate (births per 1000 population). The red segment from 1946 to 1964 is the postwar baby boom, with birth rates starting to drop around 1960. Baby boomers are people born during the demographic postâWorld War II baby boom approximately between the years 1946 and 1964.According to the U.S. Census Bureau, the term baby boomer is also used in a cultural context.nited States birth rate (births per 1000 population). The red segment from 1946 to 1964 is the postwar baby boom, with birth rates starting to drop around 1960. Baby boomers are people born during the demographic postâWorld War II baby boom approximately between the years 1946 and 1964.