1. Ancient Solar Power
A gift from the gods

2. Ancient Greeks
In the 7th century B.C.E., used magnifying glass to start fires

3. Ancient Greeks
By the 3rd century B.C.E. they were using mirrors to light torches for religious ceremonies.
They also were building houses facing south to catch the most light in the winter to keep warm.

4. Ancient Rome
In the 1st century B.C.E., Vitruvius visited Greece and brought the techniques for solar heating back to Rome.

5. Ancient Rome Around 100 C.E. clear glass was invented.
This was used for windows which helped to trap in heat from the sun
Especially popular in heating the bath houses