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The tunguska event has no precedent in recent human history.If it did have one we would have heard in folklore of tidal waves,forests being flattened,towns,cities etc.There would even be craters in the ground formed recently.Did humans do something that enabled tunguska to happen.I have heard that because of human activities the atmosphere has been warming for at least 200 years.Has this warming changed the Earth's magnetic field by affecting the ionosphere.And could the magnetic field have then attracted a large meteor with a high iron content for example (iron being attracted by magnetism).Could any other (non magnetic) change in the ionosphere allow more meteors to strike the Earth , particularly the bigger ones.If the Earth's atmosphere as a whole reflected less light back into space would the reduction in pressure of radiation on rocks in space (tending to push them away from Earth very slightly) encourage more to fall to Earth? People have taken a lot of iron out of the ground and spread it all over the world.How has this affected the Earth's magnetic field?
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