The document discusses research on the impacts of elevated CO2 levels on wheat production in Australia. Key findings include: - Wheat grown under elevated CO2 (550 ppm) at two sites in Australia showed yield increases of 22-61% depending on location and year. More stimulation was seen at the drier location. - Elevated CO2 decreased grain protein levels by 4-13% but increased nitrogen uptake in straw and grains by 24-63%. This has implications for wheat quality and nitrogen management. - Crop modeling found that despite experimental yield increases under elevated CO2, future changes in rainfall and temperature are predicted to result in yield losses of 10-20% in some regions and gains of 10