The systematic study of the natural world through observation and experiment.


energy ethics 5 [cite]

5. Energy, Justice and Peace, p. 85.

energy science 2 [cite]

2. Pontifical Council for Justice and Peace, Energy, Justice and Peace: A Reflection on Energy in the Context of Development and Environmental Protection Vatican City, 2014), p. 19.

Energy from sun [citation]

Withgott and Brennan, 4th edition, Environment: The science behind the stories

rooftop solar water heater [photo]

Figure 12: Simple model of rooftop solar thermal hot water heaters which are used in the vast majority of homes in Israel. Water from the home system runs through coils in the solar collector panel, which heats the water. Heated water is stored in the tank for distribution back into the home system.[fn][[nid:1251]][/fn]

rooftop solar thermal water heater [cite]

Gilabrand at en.wikipedia [GFDL, CC-BY-SA-3.0 or CC BY 2.5], via Wikimedia Commons