Global Warming

In standard BtS, global warming is a bit of a joke. It is triggered by the wrong things, you can't really do much to prevent it, and it hits the world in a harsh and unintuitive way. I've completely changed it.

In short, it works like this:
Every point of unhealthiness is counted across the world. If this total is more than some threshold amount then global warming becomes possible, and the likelihood increases as long as the unhealthiness total is above the threshold. There is an environmental advisor which can tell you all the details (on the same screen as the financial advisor).

When global warming strikes, it no longer removes the tile improvement, and it doesn't turn the tile straight into desert, so each strike is far less severe than in original BtS. Also, global warming is more likely to strike cold tiles before hot tiles. eg. The ice caps are likely to melt before your plains get turned into desert.

Positive healthiness (eg. from hospitals) does not reduce the global warming pollution, but a environmentalism and public transport have been changed so that they do reduce unhealthiness rather than increase healthiness.

As global warming becomes more likely, civilizations start to get a happiness penalty which is based on their relative contribution to global pollution.

In standard BtS global warming typically either did nothing, or it completely trashed the world; by contrast, global warming in K-Mod will not trash the world - at least not before someone wins the game - but the effects of global warming will ramp-up towards the end of the game, giving a kind of sense of urgency and tension, this helps build up to a _climactic finish_ at the end of the game.

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