There are solar chargers, and then "Snow Energy," a sustainable lamp and a mobile device charger that works in all types of climates, including snowy mountainous regions. This is possible thanks to a thermoelectric generator that works by generates energy when there is a temperature difference between the upper and bottom sections of the unit. Continue reading for images showing exactly how it works.
"The light bulb head serves as the vacuum flask for containing hot water to warm the heat pipe which is connected to one side of the thermoelectric generator module. The other side of the module is the spiral-shaped heat sink containing a rechargeable battery. After pouring hot water into the vacuum flask and assembling it with the other components, the user needs only to stick the heat sink into somewhere cold," reports Yanko Design.