World Earth Day Let us act together to protect our home planet. April 22 every year is World Earth Day. This is an important day to call on people around the world to take action together to protect our home planet. As human beings\’ unsustainable development has caused more and more harm to the earth, we need to take action to protect our environment. The following discusses how to act together to protect the earth from multiple aspects. Save energy and reduce carbon emissions. Saving energy is the key to protecting the earth.