There are multiple international cooperation frameworks that call for global measures to respond to climate change and support sustainable development. Given the urgency of the topic, a special, environment-related framework has been added to the TIMSS 2023 Context Questionnaire Framework. More precisely, the TIMSS 2023 Student Questionnaires will measure fourth and eighth grade students’ attitudes about the natural environment, as well as their enactment of environmentally responsible behaviors. Home, school, and classroom contexts contributing to these behaviors will also be represented in the Home, School, and Teacher Questionnaires. TIMSS 2023 data collection will start in the spring of 2023. These internationally comparable data will support research about children's environmental attitudes, behaviors, and education across countries.