There will never be the unified global political will to make the kind of changes necessary to effect real change because the problem is an eye blink in evolutionary terms but half a lifetime away in human consciousness terms. Humanity is the frog in the slowly heating pot of water. By the time we figure out we are boiling to death it will be too late. The final injustice is the peoples who have the wealth and technology to actually effect change are also the ones with the wealth and technology to minimize the effects of global warming on themselves in the meantime.