They agree on HOW to learn about those things. There's a huge gulf between empirical observations and explanatory theory. There are plenty of cosmologists around that do not accept the Big Bang theory even now - in fact, there are probably proportionately more now than 20 years ago. There are thousands of climatologists, geologists, meteorologists, and physicists who think that anthropogenic globe warming is crap. Few, if any, though disagree with the opposing theoreticians about the fundamental methods required to actually gain an understanding. What is interesting from an anthropology-of-science view point is that often these divisions between theory-based cliques lies along the divide between observation-based theory and theory-based observation. Theory-based observation expects observations to help verify theory, while observation-theorists often take any unexpected observation as grounds for new theory. The division that emerges is from the basic divide between mind sets that are convinced they have an explanation and mind sets that are convinced they have found a shortcoming the popular theory does not cover. Cliques tend to nucleate around issues and - ideally - new or modified theory emerges. The disagreement is not a bad thing necessarily, but occasionally it can devolve into what amounts to gang warfare.