The post is actually not provocative at all. It is state-of-the-art science. But to say the truth, I agree the title of the post and the first image are provocative (and funny too, aren't they?) :)

If dark matter annihilation indeed contributes to the rise of Earth's temperature, in what ways men could interfere with this in order to slow down global warming?

One must be careful on what is the cause what is the consequence here.

First of all, there is a heat flow outgoing from the planet. It is well measured: 47 TW (with an uncertainty of about 5% on the number). This measured quantity is included in the climate models that deal, among others, with the global temperature no the planet. Therefore, dark matter can or can't contribute to the 47 TW. This will always be 47 TW (it is measured).

Next, let's take a dark matter model. Sometimes, there is a contribution to the heat flow of the planet (the 47 TW), sometimes not. When such a contribution exists, it must be calculated and one must verify that it does not challenge the 47 TW measurement. If it is the case, the model is just excluded.

Therefore, this model has no influence on climate changes at all. It can contribute to one parameter of the climate models, that is taken as a measured value anyways.

Is this clearer?