(2007) concluded, with very high confidence, that regional temperature trends had already affected species and ecosystems around the world (p. 792). With high confidence, they concluded that climate change would result in the extinction of many species and a reduction in the diversity of ecosystems (p.
Full Answer. Use of the Gregorian calendar keeps the arrival of spring on March 20 or March 21 for most years, though sometimes spring arrives on March 19. According to National Geographic, in addition to the astronomical start of spring, a biological spring begins each year, usually on a different date.
Here are the months of the year divided into seasons with the actual dates: Spring - Spring goes from March 21st to June 20th. Summer - Summer runs from June 22nd to September 21st. Fall - Fall falls between September 22nd and December 20th. Winter - Winter descends from December 21st to March 20th.