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.
The general fertility rate (GFR) is the total number of live births per 1,000 women of reproductive age (ages 15 to 49 years) in a population per year.he general fertility rate (GFR) is the total number of live births per 1,000 women of reproductive age (ages 15 to 49 years) in a population per year.