PoW coins that's relatively low in traffic, newly created with low amount of miners or PoS coins.
This is super wrong. Transactions are very green. What is not green is POW that seucres the network (POW uses majority of power to just quess random numbers not by computing transactions). So if you have a coin that has high marketcap (a lot of people mine it because its profitable), is secured by a lot of energy, and no one is using it for transactions (low traffic) than we have a situation in which network is oversecured, miner mine empty blocks and all this power is wasted. The most green POW projects are those whose blocks all filled to the limit all the time (ETH, BTC).
If someone is looking for green, low cap, innovative consensus - check proof of person - IDENA is the biggest player there.
I think it is crucial to have data from several years to see whether a coin is secure or not. We can say with certainty that Bitcoin has been attacked often times but never failed. I don't know IDENA but can it be said that it is as secure as Bitcoin?