I touch earth, I touch the sky, but if I touch you, you will die.
What am I?

Tread on the living they make not a mumble,
Tread on the dead they mutter and grumble.
What am I?

On the earth I am dead, though I live on the moon,
I am no creator, and I’m in every boom.
What am I?

Alright, thanks Google, now answer mine,

I am popular, people love me,
I am bad for them, but I am not free.
What am I?

1 Lightning
2 Leaves
3 The letter O
4 Video games