Many people think those verses are suggesting that the wars, earthquakes, food shortages, etc are all a sign that the end is imminent. However, a careful examination of the context seems to suggest that Jesus was actually forewarning his followers not to draw such a conclusion from such events. See this interesting article on the subject:
http://meletivivlon.com/2012/12/18/wars-and-reports-of-wars-a-red-herring/