future of our planet. It's the driving focus of this young climate hero you're about to meet. How she's hoping waves of future generations right now. Water plays a pivotal role in how the world adapts to climate change. Within 50 years many regions in the U.S. Could see their water supply decrease by as much as one third. Water is so integral for our climate solutions, but often not something we are addressing. Climate activist shreya ramachandran has witnessed up close what can happen when you live in a region where water is scarce. I visited my grandparents' home in south India during a I had to stand in line to get water. I realized it wasn't just India that was suffering from drought. I saw people's well ran dry, leaving them completely waterless in California. Reporter: A concept that could alleviate this crisis, grey water. Grey water is the likely used water from sinks, showers, baths, laundries. It's a method of taking the grey water from your laundry and putting it out to irrigate your plants. Two thirds of the world lives without drinking water for at leas one month out of the year. Grey water can be implemented anywhere in the world. I did a lot of work with schools and developed a grey water curriculum. If you teach people young how important water conservation is, they'll make those practices a part of their every day life as they become older. It will be just something that you do. Reporter: Named a national geographic young explorer she now has a grant to continue her work. She hopes to change the flow of water consumption for good. The changes that communities make create a ripple that generates that massive wave of change that I'm hoping to implement. Really appreciated the series this week highlighting some of these young game changers.