We do learn more and more. It's called science.
In the realm of very vaguely related news stories, 8 days before we are due for a cosmic close shave so close that it could whack an orbiting satellite or two, we read that there is even more evidence that the massive impact that produced the Chicxulub crater was in fact if not the sole cause almost certainly a contributor to the massive extinction event whose most famous victims were the dinosaurs. Gotta love it. This is the way science works when dealing with questions about real world events that can't be answered in repeatable laboratory experiments though some don't seem to appreciate it. Scientists have to not only ask not only the questions concerning the event they are researching but what kind of traces are there to help them find those answers. This is what climatologists do in order to try and find the answers concerning climate change. In spite of what some whose fashion sense should include tinfoil hats claim, they are not involved in a massive hoax or conspiracy. They ask questions and go where the evidence takes them. As they should.