(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.
The spring (vernal) equinox will occur on Sunday, March 20, 2016 at 04:31 UTC. In the United States, this translates to Saturday, March 19 in the Central, Mountain, and Pacific time zones (11:31 pm CDT, 10:31 pm MDT, 9:31 pm PDT).