Our earth is in fact a little star or a minuscule heavy core aka black-hole. By pressing mass together in the hot center of the earth it releases a jet of energy which is in fact electricity + sub-particles, which in my view is what magnetism is. If we want a stronger magnetic field around the earth then we should feed it with heavy material like iron and trow it in some volcano's as they are the gateways to the underworld. Earth has had his feeding seasons with heavy iron asteroids but alas these events come with destruction of most lifeforms on the crust as well in the oceans. So feeding in smaller quantities is more favorable.

Grtz, Dirk.

Why would we need a stronger magnetic field around the Earth?

Maybe to have a stronger protection against the sun? It is not meant to do it actually, but more as a brain exercise how i can put different happenings and forces together in one view or example. Here for example the trigger was the science research on the pole's and why they got a stream of particles going out of the pole's while they could not think why this would happen.

Grtz, Dirk.

Russian scientists have observed a correlation  between magnetic fields and people's well-being.  Thus, when magnetic fields intensify there is a significant increase in people's complaints about feeling unwell, headaches or aggravation of chronic illnesses conditions.   If it affects humans, it might affect other living being: animals, plants, insects.  By the way, spiders are using magnetic fields to fly.))  I read an article about it not long time ago. 

Stronger magnetic field around the Earth could attract more meteorites or asteroids, or,  in longer term, change Moon's orbit, could it?

Any opinion?

The increase of magnetic field strength can cause the extinction of humanity on this planet

Exposure to magnetic fields of great magnitude and / or for long periods can be harmful to health. The World Health Organization maintains research on the effects of exposure to electric and magnetic fields and recommends that exposure to the general public to time-varying magnetic fields in the 50-60 kHz frequency is up to 83x10-6