Future climates are expected to be warmer than those currently experienced by terrestrial ecosystems. The acclimation of plants to temperature, is therefore, as important of a component to predicting ecosystem response to global change as the response to elevated atmospheric CO₂ concentrations, which were the subject of the previous generation of free-air carbon dioxide enrichment (FACE) and other large scale ecosystem experiments. Technologies are now emerging that enable and improve the control over experimental warming of plants at different scales in the field, greenhouse and laboratory. In recent years, have we seen multiple large scale manipulations of growth temperature in field experiments, sometimes in conjunction with elevated CO₂ concentrations. These large-scale field experiments have also generated considerable interest in greenhouse and laboratory studies of physiological responses to temperature. This session aims to bring together research from several such studies on the physiological responses of vascular plants to temperature. This includes, but is not limited to, responses of growth, allocation, photosynthesis, respiration, transpiration and water transport. Experimental warming and measured responses may be conducted at a variety of scales, from the whole ecosystem to individual leaves. Under consideration will be the measured responses to temperature, as well as the scalability of such findings to projections of ecosystem function in a changing world. Understanding which responses translate to intact ecosystems, and which may not, is a critical step in how physiological ecology impacts the greater ecological community and societal decision making. The organizers hope that contributors and attendees emerge from this session not just better informed about current developments in this quickly evolving field of study, but also with a broadened perspective that facilitates collaboration and the synthesis of knowledge across studies, ecosystems and disciplines.