Hey Viktoria, I wholeheartedly agree with your last point that bringing back long extinct species could be detrimental to current ecosystems. Very rarely have humans in the past introduced a new species into an environment and have there be overall positive effects. It seems that the most sensible solution to any climate change or animal endangerment issue is not to bring about some sci-fi solution from thousands of years ago, but to just correct our mistakes and take away what is actually causing the negative things, specifically through environmental law and creating stronger restrictions on companies that take away or damage the earth in excess. I think if we tried that first, and it actually didn't work, I would be more open to the idea of bringing back the woolly mammoth.