Long-Term Picture (IMAGE) Columbia Climate School Caption Summer seasonal temperature anomalies revealed by tree rings and modern weather data, 950-2021. Credit Modified from Heeter et al., Climate and Atmospheric Science, 2023 Usage Restrictions Credit must be given. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.