> Nothing will change until developed rich countries are starting to hurt.

There are two clear parallel points to this:

   1. Over the time frames we're discussing (even the next 50 years) how many "poor" countries will there be left? We're seeing substantial progress on economic, educational, and other fronts over the past 50 years.
   2. Will there ever be a time when the change occurring is direct and over a short enough time frame to matter to "rich" countries? Yes, it will suck if most of Florida is underwater, but this process has already started, and has been going on for 20, 30, 50 years? And most people care very little. If it takes a century for the state to completely submerge, that apathy will continue.

Disclaimer: none of the above is saying we should or shouldn't take a particular course of action about warming, just to speak to the way people deal with very slow-moving issues.