There's a rational answer to that. The ideal world temperature is somewhere in the vicinity of what it is now. A world five degrees cooler would be an ice-age world. That might be good for polar bears, but it wouldn't be good for people. A world five degrees warmer would be a world in which the rice crops of Asia, and the corn crops of Nebraska, would be much reduced by heat stress. We know this because we've had hot summers from time to time in Vietnam and Nebraska, and the crops did suffer. But back when, those hot summers were rare. Put temperatures up 5 degrees across the board, and hot summers (hot enough to damage crop yields) would become much, much more common.
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