Here are two related articles you can read and a radio podcast you can listen to:
When did Earth Day begin? (BBC News)
Activities for my 2º ESO students: What can you do to save the Earth? Use the future tenses learned, real conditionals and hypothetical conditionals.
Here's a listening exercise to do: Microadventures! (6 Minute English, BBC Learning English)
FUN ENGLISH LESSON with Big Bang Theory & Star Wars
Here's a new section in BBC Learning English: The Experiment. The first unit deals with...