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.
fertility rate - the ratio of live births in an area to the population of that area; expressed per 1000 population per year. birth rate, birthrate, fertility, natality. rate - a magnitude or frequency relative to a time unit; they traveled at a rate of 55 miles per hour; the rate of change was faster than expected.