The movement of wind and water, the heat and light of the sun, the carbohydrates in plants, and the warmth in the Earth—all are energy sources that can supply our needs in a sustainable way. A variety ...

Heat energy from the Sun is absorbed by everything on Earth, including us. While light energy from the sun makes things visible (if you've got your eyes open). People have invented ways to ...

But all that is about to change, as the family joins a small-yet-growing group who are tapping into a network of underground energy to heat and cool their homes. Massachusetts, like the rest of ...

Thermostats, light bulbs ... "It gives you greater control over the heating and cooling in your home," he said. In the winter, the US Department of Energy recommends setting the thermostat ...