Event:
The average monthly world CO2 concentration exceeded 400 ppm in April; the U.N. has set a 450 ppm limit for all greenhouse gases to reduce climate impact; concentrations for CO2 and all greenhouse gases averaged 391 and 430 ppm, respectively, in 2011
More Notable Events on May 2:
1997 Donald Trump and Marla Maples announce they are separating
1983 6.7 earthquake injures 487 in Coalinga, California
1919 1st U.S. air passenger service starts
1902 1st science fiction film released, A Trip To The Moon
1890 Territory of Oklahoma created
