magnetism shielding us is why there is life - this is why there is no life on the smaller planets of mars and venus
it's complete nonsense that they used to have life, without protection from radiation DNA is destroyed and at best there might be bacteria in the soil far down below the surface where it's wet and stuff
but it's true, without cells aggregating carbon into fibres there would not be fire very often
once in a thousand years an oil spring would catch fire from a freak lightning strike on a very hot day