Environmental advocates to take part in the "Eco Walk" at the University in the Philippines in Quezon City organized by Kalikasan with AGHAM - Advocates of Science and Technology for the People, Center for Environmental Concerns - Philippines and many others. The activity, held a day ahead of Earth Day, aims to promote environmental awareness and education to people of all ages through activities such as bird watching, nature walks, and urban gardening. Photos by RB Ibañez/350.org