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Thanks tar sands

Thick as fog but light as air.
You never see me coming.
I cloud your senses and grip your life.
My ways are truly cunning.
I fill a room in no time flat.
I can cause folks to die.
My brother and sister are solid and wet.
Question: What am I?

I am what goes up but seldom comes down.
I am needed but hated.
I am useful in multiple ways.
I somewhat hold the future.
Question: What am I?

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