Mining is an environmental and human rights nightmare. Battery recycling can ease that.

A growing population has led to a growing mountain of trash for Africa. One city is taking control of the issue by turning that trash into energy which not only reduces the amount of physical rubbish by 80 percent, but also powers 30 percent of the city's household energy needs.

Bioeconomy is the practice of using biological processes and organic materials to reduce waste, and it's gaining traction as a means of business. Finland is home to one of the largest bioproduct mills, where "a whole ecosystem of companies" work together on projects such as converting sustainably logged wood into pulp before selling it to Europe and Asia and producing solid biofuels which will eventually create electricity.

Rotterdam, a port city once at the center of trade and commerce, is now threatened by climate change. The city has responded to this threat by totally transforming itself into a hub for sustainable design. It embraces crazy, environmentally friendly solutions. From a floating dairy farm to a home enclosed in a greenhouse to basketball courts that soak up rainwater, Rotterdam has established itself as a leader in sustainable urban design. By 2025, the city plans to be completely climate-proof.

A Japanese alcohol distiller is using sweet potatoes to generate electricity. By using as much as 1,200 tons of sweet potatoes a day, they are able to turn the vegetable and turn it into biogas. The distiller generates about 8.5 million kilowatt-hours each year, which is used to power company-owned electric vehicles.

Pollution caused by demolition is expected to be 2.2 billion tons by 2021. However, up to 75 percent of materials in a demolition can be recycled. An alternative method to demolition is deconstruction or unbuilding. The method always for lumber and other materials that are recyclable to be salvaged. Cities like Vancouver that have passed ordinances encouraging recycling saw results. One company, "Unbuilders," that specializes in deconstruction shows that using methods like tax receipts and appraisals can lead to both profit and better results for the environment.

After lithium-ion batteries from iPhones, laptops, or electric cars are used up, the Ontario-based company LiCycle recycles parts of them to be reused in new batteries or in other products. While the recycling process isn’t completely environmentally friendly, the company is able to recover 95 percent of the raw materials and says their operations produces no carbon emissions, wastewater, or solid waste.

To preserve the millions of trees that are cut down just to produce coal in Burkina Faso, a Burkinese engineer created "green charcoal that would not only protect forests but also help fight against the proliferation of garbage." This ecological fuel is made from carbonized collected garbage and coconut husks, which in turn has reduced the amount of garbage that has to be managed by the authorities in charge of sanitation.

The town of Athens, Georgia has committed to a 100% renewable energy pledge. Both the local government and local businesses are working towards it by implementing sustainable practices such as solar panels and wastewater pretreatment systems.

Food waste often ends up in landfills, but the Wasatch Resource Recovery facility in Utah transforms the thrown-out food into renewable energy instead. Companies such as Kroger, Dannon, and Nestle send their food waste to the facility on a daily basis, where it is liquefied, broken down by microbes and eventually converted into natural gas.

Finding ways to implement circular systems reduces the environmental impact of festivals. The London-based nonprofit, a Greener Festival, works with festival planners across Europe to make events more sustainable. In addition to recycling and moving toward plant-based food options, a Greener Festival also leverages its partnerships to collect and reuse catered food through its EighthPlate initiative.