Environmental perspective is one of the five core tasks mentioned in the Swedish Curriculum that should permeate instruction of all subjects.  WebEnglish.se suggests the time between Earth Hour 25/3 and Earth Day 22/4 to be dedicated to studies about the Earth, sustainable living and the future of our planet. Material can be found in Teaching by Calendar  for these specific dates and more in the theme pages Environment 5-7 and Environment 8-9