Portal was the first Valve-developed game to be added to the OS X-compatible list of games available on the launch of the Steam client for Mac on May 12, 2010, supporting Steam Play, in which players that had bought the game either on a Macintosh or Windows computer could also play it on the alternate system.
1 Eurasian Pleistocene megafauna became extinct in roughly same time period despite having a much longer time to adapt to hunting pressure by humans. 2  However, the extinction of the Eurasian megafauna can be viewed as a result of a different process than that of the American megafauna.
Why are species going extinct due to anthropogenic changes? Species are poorly adapted and therefore are unable to survive. Massive changes occurring rapidly all over the Earth are causing species to go extinct in a random pattern. Only those species sensitive to warmer temperatures are going extinct. Species are going extinct at the same rate as always.