The Intergovernmental Panel on Climate Change concluded: "most of the observed increase in globally averaged temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic greenhouse gas concentrations".

The basic conclusions reached by the IPCC have been endorsed by at least 30 scientific societies and academies of science, including all of the national academies of science of the major industrialized countries.

The American Association of Petroleum Geologists is the only scientific society that officially rejects these conclusions.

You state that "Cleveland Indians shortstop Ray Chapman [wiki] was the only man ever killed by a baseball pitch." ... I believe this to be false.

The below info is from http://www.peterga.com/baseball/numbers.htm

People killed by pitches ("Bill James Baseball Abstract" 1985 p.131):

* at least 4 in the minors between 1909 & 1920
* 1920 Ray Chapman (Carl Mays)
* 1951 Ottis Johnson (of Dothan) last player in org. ball to be killed by pitch

see BJBA p.137 for full list

... I bothered to look this up because my own cousin was struck by a pitch during a pick-up game and developed a brain aneurysm was sadly took his life.