In rural communities throughout India, having access to clean water does not always come easy. Sarvajal, originally a non-profit experiment, believes that water insecurity is a solvable issue, however. By helping those living in the rural communities take ownership through entrepreneurship, common sense, and the patience to reinvent old systems with more efficient technology, the group has achieved the ability to distribute small reverse-osmosis filtration plants and Water ATMs throughout the northwestern Indian states.

In many rural communities in India, access to clean drinking water is still scarce. The cost of bottled water is prohibitive, city pipes are in poor condition, and the municipal tanker trucks that supply some water are haphazard. But a social business called Sarvajal is busy scaling up a solution: a water ATM. These machines allow people to scan a pre-paid card and withdraw purified water from a stable, convenient source within their community when needed.

Scientists and activists in India are training citizens to collect information on water issues like contamination — and upload it so it can be used to push for change.

When large-scale hog farms began moving into rural Iowa, many local families were forced to start making decisions about their ways of life, especially concerning their own farms and health. To fight back, the community gathered together to create a covenant. Although small in scale, other communities in the state have reached out in hopes of following their so-far successful approach.

A hygiene intervention in a wooden branch, recycled plastic jug, and a bit of soap tied to some rope—a cheap solution that allows access to sanitation in poor communities without incurring major expenses.

The company that manufactures Lifestraw, a water purification device, has found a way to distribute their product to impoverished Kenyan families for free, while still making a profit. In the global carbon credit market, businesses receive carbon credits for projects that reduce greenhouse gas emissions. These credits can then be sold to companies who need to offset their carbon emissions, allowing green companies to make a profit off of their small ecological footprint.

Armed with data, local activists are taking on environmental justice campaigns. In the absence of action on the part of the Federal Government, local organizations in Mississippi and across the South are working to increase transparency, generate data on public health issues, and mobilize action on climate change.

The Mara River that runs through Tanzania and Kenya is used as a significant resource by 1.1 million people throughout the surrounding communities. For years, artisanal miners have also used the river to clean their gold, but this has polluted the river and increase chances of mercury poisoning. One community has created a gold refining pond to simultaneously continue promoting the importance of washing the gold as well as keep the pollutants out of the Mara River.

Fed up with living in the world's most polluted city, some residents are fighting back, on their rooftops and backyards. In 2010, India launched the Jawarharlal Nehru Solar Mission, a government program to deploy 20,000 megawatts of grid-connected solar power in the country, but much of this push for renewable energy has only been focused on rural areas, leading urban residents to take up local control of their energy supplies.

Official in Bangkok, Thailand unleashed a small fleet of drones to deal with the hazardous levels of air pollution plaguing the city. The drones were outfitted with canisters capable of spraying water and a "non-hazardous chemical spray." The pilot project successfully reduced air pollution by small amounts.

The supply chain for Valentine's Day flowers is incredibly toxic for the environment and produces mass amounts of waste. In response, a "floral gifting" service industry emerged in which flowers from special events can get repurposed or recycled. One such company, NYC-based Repeat Roses, has a special service that restyles the flowers into petite bouquets to donate to hospitals, nursing homes, and family shelters. Their efforts have diverted more than 98 tons of waste from landfills and delivered almost 53,000 floral arrangements to people in need.

Clean water and healthy ecosystems are becoming increasingly difficult to come by. With floating islands and other inventions, eco-entrepreneur Bruce Kania thinks that biomimicry - such as reconstructing wetlands and growing biofilms - can tackle the toughest of water problems.