Europeans were burning their trash and using the energy to make electricity by the late?

In 1876, the English burned, in a unit they called a “crematory,” solid waste for fuel to generate steam to produce electrical power.

why was the national assembly formed by the third estate?

the estates-general had not been assembled since 1614, and its deputies drew up long lists of grievances and called for sweeping political and social reforms. the third estate, which had the most representatives, declared itself the national assembly and took an oath to force a new constitution on the king.