@cristina__ Your example: “historians use the past to figure out how human activities and behaviors relate to the environment in which the people lived while scientist will view this exact same time but use it to help them with their claim of how the world is today for example” I find to be inaccurate. Historians just as much as scientists view the past as controlling how the world is today. What I find troubling about this statement, and perhaps it was unintended, is that it sounds like a lead in to a general attack on science.
But I’ll try to get at the only difference I can see making sense. Academically, in terms of actual research and publication, physical scientists and historians ask fundamentally different questions and use fundamentally different methods to answer them. Historians are interested in how human civilization got to where it is now through it’s own actions, while physical scientists are interested in how some physical process works in the world, independent of the development of civilization. They might ask how humans have affected a certain process, but it’s not about how and why humans went from the horse drawn carriage to the internal combustion automobile, but rather about what chemical properties of gasoline engine exhaust are doing to atmospheric processes.
These different questions result in different methods: historians analyze written (or recorded) records of past events, seeking out first person sources when possible, to determine what events occurred and how contemporary people interpreted those events and using this information to formulate an interpretation of what motivated those past individuals and what the long term effects of their decisions was.
Physical scientists, on the other hand, perform discrete experiments to determine how things happened in the past in some physical process, and make the reasonable assumption (because it has never been falsified) that the same physical processes and the same chemical reactions happen now that happened fifty million years ago. The half life of Carbon isotopes does not change. The reactivity of hydrogen and oxygen does not change. So scientists can look at what chemicals existed in the past, as recored in rocks and fossils, and accurately extrapolate what physical processes were involved with those chemicals. Or they can look at a set of bones found together and determine that there are a limited number of ways those bones could have been pieced together in a particular organism and how that organism could have moved (because gravity and other physical laws have not changed in 65 million years).
What my examples point out is that physical scientists and historians tend to deal with entirely different time scales. Physical scientists may be interested in what happened millions or even billions of years ago, or they may be interested in comparing the atmospheric concentration of sulfur dioxide from thirty years ago with the present concentration.
Historians, on the other hand, may deal with fairly recent events, but as a whole are interested in the finite timespan in which written human history exists, that is between about 5000 B.C and the present.