I have never heard of green exchange before that is related to cryptocurrencies, I will also advise people to stay away from this type of project. The only coin I heard of is greenex, the coin was pumped up to $400 and has now decreased less than $1. New projects are generally risky and many are nothing but scam that people should avoid.
This topic was made as an answer to my ask to get refund for service, that they took money, but didn't finished, in this topic.
https://bitcointalk.org/index.php?topic=5376009.0If you didn't heard about green exchange, don't judge so quick.