Tim Cook shares four 'shot on iPhone' images to promote Earth Day

The tweet from Tim Cook calls on readers to "embrace our shared responsibility to each other to take care of our one and only planet." The message also wishes a "Happy #EarthDay" and promotes the names of the four photographers who took the images featured in the latest "Shot on iPhone" collection.

The four photographers are identified as Ether Havens, Sarah Norvell, Jason Barnes, and Vincent Riemer. All four of the images feature nature and animals in different ways, such as a wide shot of a giraffe near a tree under a stunning skyline and another of a small green frog resting in the middle of a large orange flower.

The "Shot on iPhone" social media campaign is used to highlight the quality of the cameras onboard the iPhone, with Apple occasionally picking high quality submissions and showcasing them in advertising and social media posts. As well as photographs, the campaign also uses documentaries and short films that are entirely filmed on an iPhone as the camera, with the latest being the "Don't Mess with Mother" short.

Cook's tweet is part of a number of ways Apple is celebrating Earth Day, including advising of how it is helping to protect mangrove forest in Colombia, expanding its recycling programs, providing Today at Apple Sessions and App Store highlights themed for the occasion, and a special "Earth Day" Apple Watch award for completing a 30-minute workout outside.