The verb heal is used to talk about freeing people or things from ailments and making them healthy, whole, or sound. The synonym restore is not used in exactly the same way; you might heal from a wound, but you would not restore from a wound. You could, however, restore order, that is, reestablish order or bring it back into existence, or you could restore a painting, that is, bring it back to a former condition. But neither of these uses overlap squarely with heal. Restore is closest to heal when used in the context of bringing a person or thing back to a state of health, soundness, or vigor after suffering damage or depletion: After a grueling week that left her feeling quite exhausted, a long hike in the woods restored her vitality. In the context of ecology, the related noun restoration refers to the act of bringing ecosystems that have been damaged or destroyed back into balance by way of human intervention. The theme for Earth Day 2021 is Restore Our Earth, a call to action that invites everyone to take an active part in bringing the world’s ecosystems back into balance through natural processes, emerging green technologies, and innovative thinking.