models-the climate kind

This joke was found in a blog comment. In some ways it says it all.

An engineer, a scientist, and a global warming modeler were all interviewing for a job.  The interviewer calls in the engineer first.  The interviewer tells the engineer, "I have one question, what is 2+2"?  The engineer replies, "I can tell you with exact certitude the answer is 4.00000".  The interviewer makes some notes, lets the engineer go and then calls in the scientist.  "I have one question", says the interviewer.  "What is 2+2?".  The scientist thinks for a moment then replies, "I can tell you that the answer lies somewhere between 3.998 and 4.002.".  The interviewer lets the scientist go and then calls in the global warming computer modeler.  The interviewer tells the modeler, "I have one question, what is 2+2?".  The modeler thinks for a moment, looks to the left of him, then looks to his right.  Then he lowers his head, leans in and whispers to the interviewer, "What answer do you want it to be?"

After the joke was circulated among family it was returned with this revised ending:

An engineer, a scientist, and a global warming modeler were all interviewing for a job.  The interviewer calls in the engineer first.  The interviewer tells the engineer, "I have one question, what is 2+2"?  The engineer replies, "I can tell you with exact certitude the answer is 4.00000".  The interviewer makes some notes, lets the engineer go and then calls in the scientist.  "I have one question", says the interviewer.  "What is 2+2?".  The scientist thinks for a moment then replies, "I can tell you that the answer lies somewhere between 3.998 and 4.002.".  The interviewer lets the scientist go and then calls in the global warming computer modeler.  The interviewer tells the modeler, "I have one question, what is 2+2?".  The modeler thinks for a moment answers confidently, “In the 20th century 2+2 was 4.  But in recent decades 2+2, after adjustments, is 4.2; and our models show that if we don’t change, human-induced arithmetic change could send that number to 5 or beyond by the end of the century!”

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