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On the question of earth's changing tilt as a contributor to climate change, don't discount CO2 yet:
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Though his [Peter Huybers] work suggests that orbital configuration contributes to the loss of glacial ice, Huybers was quick to emphasize that it is only one factor among many.

“It could also be that orbital forcing causes a rise is atmospheric CO2, and that it’s the increased CO2 that drives the loss of ice sheets,” he said. “In all likelihood, both CO2 and increased summer radiation contribute to deglaciation. They’re both expected to push the climate system toward less ice.

“Another important aspect to consider is that the orbital configuration we now have is almost exactly where it was 20,000 years ago, during the Last Glacial Maximum, but this time we’re near a glacial minimum,” he said. “If you think about what the difference is between then and now, it’s not the orbital configuration, it’s the CO2. I think that’s important to keep in mind, because it shows that glacial changes are not a simple function of the orbital configuration.”
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harvard_gazette climate_change glaciers peter_huybers ice_age