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Note: Many facts have been simplified to make them easier to understand. Our new free weekly podcast Time Crystal tells this story as sci-fi fantasy
Once the oil and coal run out the greenhouse gases will reduce. Then the climate will probably get colder and head towards the next glacial period as it has been tending to do for the past 5000 years. The next glacial will probably start within a few thousand years. This will be an even greater challenge to the world than global warming.