Doubt speaks, "How can I possibly be happy in such a world?"
The silence between thoughts replies, "Must the world be fixed for you to be happy?"
Jesus was in constant action, service and compassion for our planet. Yet he said, My kingdom is not of this world. He was crucified. Yet in his deepest core, he was never not happy.
If our happiness depends on our circumstance, we are tossed about by winds of karma. But if we rest in the luminosity of our original nature, the bounty of awareness simply aware of awareness, we are happy in the midst of all action, because our happiness has nothing to do with it.
Then actions can arise spontaneously, with no compulsion to "improve" the world. The restful heart does not see a snake in the rope, only a rope. Therefor, the restful heart is not motivated by panic or fear. The rope is just a rope, and the world is just as it is right now, which includes our spontaneous action to ease another's pain.
Solve the problem of this moment, without imagining a catastrophe in the future. Don't spoil the authentic beauty of your present action by trying to change the future. You can't. The world follows its own nature. This moment is inevitable.
Now here is the hardest lesson of all. Our good works may not be as good as we think, if they interfere with another's free will, or deny another's right to learn from the consequences of their own deeds.
In the mind of God or the Universe, who can say whether the works of the most passionate activist are of any more value than the patient washing of a single dish in a pail of soap suds?