Future generations will judge us to have been complete and utter idiots. There really is nothing we can do about it. We look back on the past and wonder why people couldn't see answers that were right in front of their faces, or why they treated each other so badly, or why it wasn't obvious to them that they need to go in direction A, when instead they charged wholeheartedly toward direction B. Hindsight is 20/20 as they say, and we have no way of knowing if the decisions we make today are right for the people of tomorrow.
The environment especially I think we'll get slammed on. No matter how much we say we care about it we just screw it up worse and worse.