Consumer action relies on the power of the pocketbook or billfold. It involves buying something that agrees with one's philosophy or not buying something that represents an action or an idea one disagrees with.
Political action refers to any mode of action that brings pressure on political or governmental agencies and/or individuals in order to persuade them to take positive environmental positions similiar to your own.
Ecomanagement is simply a word used to describe any positive physical action taken with respect to the environment. Examples include picking up someone else's litter or helping a private agency buy and preserve an ecologically-important forest.