Yemeni farmers tend their crops and livestock on the eve of Earth Day - in pictures

A farmer works in a field ahead of Earth Day, in Sanaa, Yemen. Every year on April 22 Earth Day is celebrated as a way to remind us how fragile our planet is. EPA

A farmer in the Yemeni capital of Sanaa. Earth Day is celebrated around the world on April 22 every year to raise awareness about the environment. EPA

A shepherd tends to his flock of sheep in a field ahead of Earth Day, in Sanaa, Yemen. The UN started celebrating Earth Day in 2009 to raise awareness about the environment. EPA

A farmer works in a field ahead of Earth Day, in Sanaa, Yemen. Restore Our Earth is the theme of this year's Earth Day. EPA

A farmer works in a field ahead of Earth Day, in Sana'a, Yemen. Earth Day is celebrated around the world on April 22 to raise awareness about saving the planet. EPA

A farmer in his field in the Yemeni capital Sanaa. Yemen is highly vulnerable to climate change-related impacts such as drought, extreme flooding, pests, disease outbreaks, changes of rainfall patterns and rise in sea level. EPA

The National