# Global warming -- Check my math/reasoning please.

**URL:** <https://boards.straightdope.com/t/global-warming-check-my-math-reasoning-please/850281>\
**Category:** Factual Questions\
**Created:** [March 25, 2020, 10:25pm UTC](https://boards.straightdope.com/t/global-warming-check-my-math-reasoning-please/850281 "2020-03-25T22:25:08Z")\
**Posts on this page:** 1\
**Page:** 3

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**Author:** ![The\_Librarian](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/the_librarian/32/402_2.png) [@The\_Librarian](https://boards.straightdope.com/u/The_Librarian)\
**Post date:** [March 27, 2020, 8:28pm UTC](https://boards.straightdope.com/t/global-warming-check-my-math-reasoning-please/850281/41 "2020-03-27T20:28:21Z")

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> [@Chronos](#):
>
> It’s not the efficiency of the least-efficient plant that matters. It’s the efficiency of the marginal plant. These may or may not be the same thing. One can imagine a nation that still keeps an old, inefficient plant on their grid because it would cost even more to decommission it, but which would use plants of a more modern, efficient design if it became necessary to add more capacity.

I never looked at it from that angle. Thanks!

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