Please read carefully before answering, why is "climate change" bad?

How do we know that the environment is not returning to a better state?
We know that the environment on the earth has fluctuated over the eons. Why is the way it has been over the last few years the best, why must this particular temperature be maintained? How do we know that the earth is not self-regulating, or returning to a more natural state?
 
It's not that we're at some optimum temperature, it's that we've designed our society and agricultural infrastructure for a particular climate, and if it changes radically it will be very costly to us, not just monetarily but probably also in terms of lives. What happens if we need to move our farms 500 miles poleward? That's a huge problem. What happens in California if most of the precipitation falls on the Sierra Nevada as rain instead of snow? It would cost billions of dollars to build new reservoirs to replace the snowpack. What happens if the glaciers that feed Asia's rivers are not there? Where will they get their water? It's not that what we have is so great, it's that we count on it being a certain way.
 
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