Below are some textbooks used in Ontario classrooms. You can find them, and similar titles in the Education Library's Textbook Collection
Holt Environmental Science Teacher's Guide by 
Living in the environment ; Second Canadian edition. by 
Earth science : geology, the environment and the universe. Teacher wraparound edition by 
Our environment : a Canadian perspective ; Fourth edition. by 
Outdoor Education by 
Nelson science & technology perspectives 7 : teacher's resource, Unit 7B ; interactions in the environment by
Supplement to : Nelson science & technology perspectives 7
Nelson science & technology perspectives 7 : teacher's resource, Unit 7C ; heat in the environment by 
A New Approach to Ecological Education by
Ecological education is becoming a major area of interest worldwide, and schools are increasingly being called upon to address global and local ecological concerns. Unfortunately, most teachers have limited or no training in the knowledge and skills required to support their students' sense of connection to the natural world. Moreover, they have been trained to teach in ways that often marginalize the imagination in learning. This book illustrates how imagination and the development of ecological understanding are closely connected. It offers teachers a practical guide to teaching in ecological and imaginative ways - needed support to establishing more ecologically-oriented education in all classrooms. As imagination takes a central position in schools, all teaching and learning can improve as a result.
DEEPER: Deepening Environmental Education in Pre-Service Education Resources
A site developed by OISE to support efforts in preparing teachers for Environmental Education. See the Activities and Lesson Plans.
Green Learning Canada
Contains free education programs about energy, climate change, and green economy. See their Resources, filter by grade and subject to get the most relevant materials for your needs.
Resources for Rethinking
A database of resources on education for sustainable development searchable by grade and topic. Resources for Rethinking is a project developed by Learning for a Sustainable Future. It provides lesson plans, curriculum units, and other teaching resources that integrate environmental, social, and economic spheres through learning that is interdisciplinary and action oriented.
Inside Education
Provides classroom resources on the environment, including interactive environmental websites, videos, and lesson ideas. Browse learning materials by level - elementary, junior high, and high school.