I think you could drastically minimize any impact by doing the time travel in space and merely observing from high orbit, assuming your time machine has no form of exhaust, which if you have a time machine seems like a relatively small engineering challenge by comparison.
You might displace a few atoms in the void, but it’s the safest way one could go about it.
I mean, technically displacing the air with that time machine on such a massive time scale is just as likely to result in returning to a civilization of dolphin people as riding a dinosaur would.
Look at the sheer scale and number of massive, malicious mistakes that one of our billionaires makes, while having ZERO impact on their tangible quality of life or lifestyle. None. Their ego score goes down and nothing else changes. The people they laid off suffer, never them.
Remember that when some pro-market capitalism class traitor nitwit inevitably tries to shame struggling people for daring to get a latte, eat Avacado toast, or get an education based on learning and growing as a person rather than solely insatiable greed.
People in the little club basically have to rape dozens of people to finally be permitted to fail, like Harvey Weinstein.
You aren’t poor because of “your bad decisions,” you’re poor because of a relatively small, insatiably greedy, powerful group of people that demand and expect almost all of the capital value your effort produces to go directly to them.
The United States has the most comprehensive social safetynet and system of redress on Earth.
…exclusively for the tiny sliver of the population that already owns everything and controls our government through institutionally legalized bribery.
As has happened for all of human history, we have devolved back to the golden rule: those with all the gold make the rules, and surprise surprise, the rules say they can’t lose and you can’t win.
Thank you Scotty!
https://en.m.wikipedia.org/wiki/Aluminium_oxynitride