You completely misunderstand (or misrepresent) that para. ...“runaway greenhouse effect”—analogous to Venus... From wiki (https://en.wikipedia.org/wiki/Venus

You completely misunderstand (or misrepresent) that para. ...“runaway greenhouse effect”—analogous to Venus... From wiki (https://en.wikipedia.org/wiki/Venus https://en.wikipedia.org/wiki/Venus) "Venus is by far the hottest planet in the Solar System, with a mean surface temperature of 735 K (462 °C; 863 °F)" So they don't expect the earth's surface to become hot enough to literally melt lead (327 °C) by a large margin. Neither do I. Hint: it doesn't need to get anywhere near that extreme before we're dead. The rest of that para does actually list some "unacceptable" and "dangerous" irreversible impacts (selective quote for space:) "For example, stability of thermohaline circulation or the West Antarctic Ice Sheet (WAIS) or the Greenland ice sheet, the mobilization of biospheric CO 2 stocks, changes in the Asian summer monsoons, loss of mountain glaciers, coral reefs"