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In 1859, the largest known geomagnetic storm struck the Caribbean, causing an aurora and telegraphs could even operate without a power source.
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Circumhorizontal arcs (loosely known as fire rainbows) are the rarest of all naturally occurring atmospheric phenomena.
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Carbon dioxide is a trace gas and by itself will produce little warming. Also, as CO2 increases, the incremental warming is less, as the effect is logarithmic so the more CO2, the less warming it produces.
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