 There are many really cool things to study in earth science. For example, you can study ice in the cryosphere, you can study the oceans, you can study land, you can also study vegetation, trees, things like this, photosynthesis. There are just a host of really cool physically-based things to study about the coupled atmosphere, surface of the earth on the continents and the oceans and how they interact. And a really good background in physics and math, perhaps biology, perhaps a marine biology, whatever some specialties are, atmospheric science, you can use those skills then to study in a quantitative way how different aspects of the earth interact and vary over time.