Apple has released Apps For Earth on April 14, as part of its campaign for a greener world. Apple is teaming up with the world's leading conservation organization, World Wildlife Fun (WWF), to raise awareness on forest, ocean, wildlife and food protection, as well as climate change.

Apps For Earth will be available in the App Store for 10 days, that means until April 24, in time for Earth Day celebration. Apple, together with 24 developers, have collaborated for the global project.

The app collection features 27 different apps, such as Angry Birds 2, VSCO photo editor, Hearthstone, Kendall and Kylie, Line messenger, and Star Wars: Galaxy of Heroes. All participating apps will have prime feature placement in the App Store.

For every paid-app purchase and campaign-specific in-app purchases for participating apps, Apple will donate 100 percent of the proceeds to WWF.

All participating apps adopt a common green theme in line with Apple's campaign. A great example of this is The Earth, which is an interactive app for kids that teaches geological forces changing the planet.

Cooking Dash is another interesting app that will feature a special Earth Day Telethon level in the game. Players can buy special in-game, eco-friendly items to decorate their restaurant.

Fan-favorite VSCO, meanwhile, is introducing a limited edition photo filter that is ideal for nature and wildlife images.

In Star Wars: Galaxy of Heroes, the beloved Ewoks make an appearance. The game developer, EA, recreated the Ewok battle in Endor, where they try to protect their forest home against the Empire.

Many developers have expressed their excitement collaborating on the project.

"It's always a delight when you can raise money and do real good," Glu Mobile's CEO Niccolo de Masi said in an interview.

Lisa Jackson, Apple's vice president of Environment, Policy and Social Initiatives and former head of the U.S. Environmental Protection Agency (EPA), explained how important it was to work with Apple's "great developer partners" on such an extensive undertaking.

Jackson also announced that Apple's green initiative isn't just limited to the App store. She said that the leaf on the Apple logo will turn green at 132 stores and the featured Apps For Earth will run on every device on display in Apple retail stores.

In a Climate Change convention held in 2015, Apple CEO Tim Cook discussed how the company has increased its efforts to promote environmental protection and preservation. Cook highlighted at that time how Apple has already taken action to reduce its carbon footprint by using renewable sources in its data centers.

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