The only real significant climate information on Mars that could be translated to indicate astronomical influence for our current climate issues would be something that could be proven to match changes in the past few hundred years.
Something that showed correspondence to Medieval Warming, the Little Ice Age, or the current warming over the past century or so would be significant.
Most of the climate information from Mars is in million to billion year ranges. I suspect any recent information would involve close observation of areas subject to seasonal ice/frozen CO2 coverage on Mars, and I don't know enough about Mars studies to know if anything has been done on this.
For one thing, CO2 ice doesn't leave much of a footprint when it melts. Water ice is more likely to leave seasonal marks if it's retreating.
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Mars climate
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- Oh Look! Mars Climate Change!