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RE: Rising the Earth's temperature... with dark matter
Okay. I got it. Dark matter was always being annihilated inside the earth through out it's history. Hence we can't attribute the recent observation of the rise in temperature to the dark matter annihilation. But what if suddenly earth is being hit by more dark matter than usual ?
No we can't. There are models, for which dark matter can be captured by Earth and annihilate inside it. In this case (and only for those models), there is a heat flux that is generated. This contribute to the total heat outcome of the planet (that we know with some precision) and we must only make sure that there is no inconsistency with the observations.
Does it clarify?
We can estimate the local density of dark matter. There is no way this can suddenly change without messing up the entire cosmology.