There's no getting around it - we need power for our day to day. Even if we want to get off the grid - having some light for our evenings is invaluable. But we can do this in better fashion, using better materials and making smarter use of power. Chargers using high density batteries means fewer cells and materials needed and lights that use solar charging takes external charging out of the equation all together!
Better materials and a more efficient use of power is key to living a sustainable lifestyle and still powering your everyday needs.