When you look at the world, what do you see? Can you justify the current state of our civilization? Can you accept the state of affairs? Do you see any way in which you can affect change?
What I see is rot, filth, disease, suffering, and death. Our human "civilization" has grown out of control to absolute and cannot be sustained. Any rational observer, of which I woefully admit there are precious few, should be able to see that the current state of affairs cannot and should not be maintained. Sadly, any rational observer will also admit that they are powerless to change anything.
To be able to affect change one needs power, and to achieve power you need support from a multitude of followers, or perhaps one large corporation. The problem with gaining the support of followers is that a) most people are not rational and b) the rational people are unlikely to truly want change. A majority of people believe the Bible or Koran or some other monkey shit-stained babble written by people who were still half in the tree. These people don't even trust themselves to know right from wrong, and their minds are already fully controlled by religious zealots, massive media conglomerates, and political pundits. Rational people, as they tend to be more intelligent, are bribed by society a generally higher standard of living and have no real incentive to affect change. The large corporation would stop supporting you immediately if you proposed a change that could negatively affect profit margins.
I've always liked the idea of the voluntary human extinction movement. Within one generation we could bring an end to all this unnecessary suffering that is human existence. This method would probably involve the least suffering, however it is ultimately impracticable unless you could implode the nearest star and bombard Earth with enough radiation to sterilize every human on earth. However, since NASA engineers can't do unit conversions correctly, my hopes for them igniting Jupiter are scattered by the wayside, unless it is by accident.
You see, humans are very good at reproducing, especially the dumb ones. Average I.Q. levels will continuously drop from this day forward. If you think the people around you are idiots now, just wait until their kids take over. There's no end to what they can't do!
Humans really are stupid animals. We will happily march to our ultimate destruction, even if there are ways to avoid it. People will fight common sense just on principle, even when the truth unblinkingly stares them in the face. They won't even move out of the way of a steamroller they own barreling their way if it means admitting they were wrong to buy it in the first place. Hubris is out of control, and the system is so stagnant and self-perpetuating that all reason for hope is truly lost.
Our feeble attempts to curb our pending destruction are laughable. The only way to get back to true sustainability is to have a truly massive die-off of the human race. We need a virus that wipes out 99% of humans. The total destruction of all major cities in every country in an all-out thermonuclear war and subsequent mass starvation could also work. The problem in either case is there would be survivors who would undoubtedly reproduce, build the world back up, and screw things up all over again. I suppose if we burned all the oil first at least they would be unable to secure a power source for industrialization. But why risk it, humans are such crafty swine.
Or, we could simply admit a seemingly simple and obvious fact, that this sad experiment called humanity has passed its useful life and should be immediately and irrevocably terminated.