The difference is that water vapour is a greenhouse gas. IIRC the net warming effect of clouds is a function of altitude.
Yes, also a mushroom cloud from a nuclear blast blocks light from passing through which reduces heating on the ground whereas contrails are thin which lets light through but still retains heat below them.
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Yes, also a mushroom cloud from a nuclear blast blocks light from passing through which reduces heating on the ground whereas contrails are thin which lets light through but still retains heat below them.