For many people around the world, getting access to clean, safe drinking water is still a challenge.
According to the World Health Organisation (WHO), "at least" 1.8 billion people around the world still use a drinking water source that is contaminated with human waste. The WHO says that dirty drinking water causes an estimated 502,000 deaths from diarrhea a year.
In India, one non-profit organization is looking to the skies to purify water. SunSaluter have developed a "solar panel rotator" which follows the sun during daylight hours, boosting efficiency and producing clean drinking water simultaneously.
The potential of solar power as a clean energy source is significant: In 2014 the International Energy Agency stated that the sun could be the planet's biggest source of electricity by 2050.
"We understand the cause is always the same for energy poverty and… clean water," Sambit Sasmal, country director for SunSaluter in India, told CNBC's Sustainable Energy.
"Focusing… (on) that, SunSaluter is basically an ultra-low cost solar tracker which just uses gravity and water to increase the efficiency of solar panels," Sasmal added.