This Reading Comprehension worksheet is suitable for higher elementary to proficient ESL learners or native English speakers. The text describes the origins of Earth Day and how the day has managed to become the biggest secular observance in the world. After carefully reading the text, students are required to complete some comprehension exercises including: comprehension questions, True or False exercises, a definitions match exercise, and a fun word search. The text can also be used for IGCSE or TOEFL vocabulary building purposes. The handout can be completed in class or assigned for homework.