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If I had a time machine, I would find the Renaissance period fascinating. The explosion of art, science, and culture during that time is incredibly intriguing. As for technologies to bring, advancements in medicine and sanitation would be invaluable to improve quality of life.
However, it's challenging to separate one technology from another entirely, as many advancements are interconnected and build upon each other.
Regarding protesting against global warming while accepting modern medical treatment, it's not contradictory. One can advocate for environmental sustainability while still benefiting from medical advancements that improve human health and well-being.