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What about methane.What about nitrous oxide,What about chlorflourocarbons? What about water vapor itself,the chief greenhouse gas?
And what about sulfate aerosols which are cooling the planet?
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https://en.wikipedia.org/wiki/Whataboutism
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Dark energy is known [only] by it's gravitational effects and the expansion of the universe.It's density doesn't change.As the universe expands there's more of it.
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Back to that? The expansion of Universe is a misapprehension of the red-shift observations. There are structurally conjoined features with vastly different red-shifts, un-explainable as expansion.
The ability to sense low-temperature gases and dust has improved recently.