Nuclear and solar for energy. Carbon and silicon for lubricants. Going back to 1st principles, as they say, hydrocarbons are the basis for an economy centered in organic chemistry. Without hydrocarbon, Mars economy will be forced to center around inorganic chemistry. In fact and based on first principles, because hydrocarbons would be true scarcity on Mars, the intrinsic value of hydrocarbon related products off world would be much higher than their value here. Hydrocarbon value on Earth is based on artificial scarcity, primarily controlled through OPEC cartel rationing. The economics of inorganic based global economies is reason to doubt the viability of long term offworld persistence for organic based life forms.