Many terrestrial systems around the world are experiencing environmental conditions that they have never been exposed to in millennia largely due to ongoing increases in atmospheric carbon dioxide concentrations and associated climate warming. These global change factors (temperature and associated 'atmospheric drying', and carbon dioxide) affect the physiology of plants, separately and interactively. Therefore, improved understanding of plant physiological responses to these global change factors has important implications on accurate predictions of terrestrial carbon storage and associated climate feedbacks, biodiversity and associated ecosystem services, food security, and global economy in future climates. My research examines specifically how photosynthesis and leaf respiration acclimate to these climate change variables in key boreal and tropical tree species, boreal peatland shrub species, and crops (wheat) as these processes are important in carbon fixation and storage, and plant growth. I use a range of approaches including controlled experiments on seedlings in greenhouses and semi-controlled experiments on mature trees in the field, and meta-analyses of existing literature. Through collaboration with vegetation modellers, my research also helps to improve the representation of these processes in global vegetation models. I also enjoy sharing my knowledge on plant ecophysiology through my teaching and student mentorship.