Hello Annale - we have a couple of other Academy participants who will be looking for ways to integrate climate change into chemistry; one inviting topic is atmospheric chemistry, and how the structure of so-called "greenhouse gas" molecules allows them to absorb and re-emit IR radiation. As for astronomy, there is a really cool connection with climate change - research on past climates indicates that the changes in Earth's axial tilt and the shape of Earth's orbit were responsible for significant changes in past climates, including the periodic glaciations of the ice ages. I think you will find some suitable topics to work with as we go through the course!