I'm referring to places like Newman [0] or Norilsk [1]. Those places have nothing to do with "utmost respect toward nature", as they are settled for mining stuff. However, they are fine examples of people being able to thrive and support a modern western-level living even in harshest of environments. No need to ditch air conditioning or your favorite SUV.

> I find it difficult to believe that no one has already done it

At this point there is no need to. The population that matters most politically (so-called "first world countries") are not affected by global warming enough to require drastic active measures. There is not enough political capital to be won in leading international talks on active Earth cooling. However, if the pain become real enough, talks will be held, rockets will be launched and the Earth will be cooled.

> Greenpeace would already be doing it

First, AFAIK Greenpeace is mostly against active measures. Second, "cheap and easy" is relative: it's "cheap and easy" as in "building a dam", not as in "occupying an oil rig".

[0]: https://en.wikipedia.org/wiki/Newman,_Western_Australia

[1]: https://en.wikipedia.org/wiki/Norilsk