Call to Earth Day: Taking action to protect the planet

All across the globe, students, organizations and individuals have been making the first-ever Call to Earth Day a huge success. Here are some more highlights from the day so far!

To eliminate food spoilage due to a lack of cold storage at key points within Nigeria's food supply chain, Rolex Awards Laureate Nnaemeka Ikegwuonu's company, ColdHubs, offers 100% solar-powered cool rooms capable of working off the grid.

Call to Earth is a CNN initiative in partnership with Rolex.

CNN's Becky Anderson spoke to students from Brighton College Dubai about how they are making eco-friendly choices in the classroom.

In Paarl, South Africa, organic winemaker Tyrrel Myburgh farms grapes in the Western Cape without modern, artificial irrigation. In drought-prone South Africa, where water can be scarce, using only rainwater to water drought-resistant grapevines is a radical step, as is allowing "a bit of a jungle" to grow among the vines, which are pruned and fertilized by free-roaming sheep.

CNN's David McKenzie visited the Joostenberg Winery, which has been producing wine for hundreds of years in the Western Cape, to see how it's going back to basics to meet the climate challenges of the future.

In Rwanda, gray crowned cranes were almost wiped out a decade ago. Captured as chicks and kept as status symbol pets in the gardens of hotels and private homes, by 2012, only around 300 remained in the wild.

But the species has undergone a remarkable recovery in the country thanks to local vet and conservationist Olivier Nsengimana. "I told myself someone has got to do something about it," he says. "Someone has got to make a change."

For Call to Earth Day, Rolex Awards Laureate Nsengimana tells us he wants to end the illegal trade in the rare bird.

Call to Earth is a CNN initiative in partnership with Rolex.

The Fruit Tree Planting Foundation is a global non-profit dedicated to planting trees for a "greener, cleaner, and healthier planet."

Their mission is to plant 18 billion fruit trees across the world to help spread vital edible eco-diversity. As part of Call to Earth Day, the group is planting trees across four continents.

Students at the University of Seychelles raise their hands and recite a pledge to protect the planet, including a promise to use more green energy.

One-third of the food we produce ends up as waste, according to the UN's FAO. One waste-management startup in Lebanon saw this predicament as an opportunity to repurpose the country’s biowaste into fertilizer.

CNN's Becky Anderson spoke to Marc Aoun, CEO of Compost Baladi, about the benefits of using compost to fuel the future of agriculture.

Nyombi Morris decided that instead of just talking about climate change, he would be part of the solution. He has been buying seeds and native plants from community gardens and local gardeners, to begin reforesting his native Uganda, which has lost much of its forests over the last century.

This year, the 23-year-old has organized tree-planting events around the country, helping to plant over 7,000 trees. He has also worked with 13 schools to teach children about the dangers of damaging the environment. For Call to Earth Day, Morris and a group of volunteers planted 500 trees in the city of Jinja, in southern Uganda.