Ways to Destroy Earth/Life on Earth

[sas3]

How about shorting out the ionosphere by hanging large conductive cables down from space.
With out the protection of the ionosphere I don’t think life would last too long on this planet.

 

[Phred101.2]

Should the special/general argument get forked to a child thread? Is my contention that we are a specialised mammal that has learned to use its special abilities to adapt to non-special conditions, up the scientific creek with no paddle?
Can we really say that H. sapiens is in fact, a generalised omnivore with no specialisation (apart from a big brain, adaptation to upright walking, intricate and delicate interaction with materials to construct equally intricate objects -something no other species, special or general, does, adaptation of symbology and language, etc. and etc.)?