This report outlines findings from a survey of teachers and school leaders in a sample of English-medium secondary schools. The survey, carried out between June and August 2020, provides insights into school-wide approaches to sustainability and climate change, teaching and learning opportunities in the classroom, and the impacts of COVID-19 on thinking and practice. The survey is part of a wider New Zealand Council for Educational Research (NZCER) study on climate change and education in Aotearoa New Zealand. Overall the findings suggest that whole-school approaches and responses to climate change and sustainability--advocated for in the international literature--are not common in New Zealand secondary schools. While students in most schools have learning opportunities relating to climate change and/or sustainability, the nature and focus of these opportunities vary. The overarching research questions guiding the project include: (1) According to national, international, and Indigenous perspectives, how could Aotearoa New Zealand's education systems and policies respond to climate change?; (2) To what extent is climate change considered an urgent issue or priority in the education system (for schools, for kura, and in terms of system-level educational policy and planning)?; (3) What can be learned from kura Maori and kaupapa Maori approaches and responses?; (4) What are the implications or impacts of student-, school-, and community-led climate responses for the educational system in Aotearoa New Zealand?; and (5) What might education look like in Aotearoa New Zealand, if climate change mitigation and adaptation were factored into policy and practice across the system? [For "Climate Change and Sustainability in Primary and Intermediate Schools: Findings from the 2019 NZCER National Survey of English-Medium Schools," see ED611339. For "Opportunities for Education in a Changing Climate: Themes from Key Informant Interviews," see ED611340.]