The link to the paper I gave is the latest research on contrails and the potential effect of contrail mitigation and answers all the questions you have asked here. The video I gave boils all that information down into an easily digestible format. It honestly baffles me that you start your reply with "Finally some science" when the very same information was already provided to you. If you want to reply to my comment without digging into the links I shared then you should specify that you haven't had a chance to look into them.