The documentary “The secrets of civilization” gave fascinating insights into how Romans changed their environment. First, there is an artificial mound in Rome known as Monte Testaccio, a big ancient waste heap which is nearly entirely made of broken pieces from discarded containers (amphora) used for, for example, storing olive oil. Here are two videos about the site:

Second, the documentary mentioned how a landscape in Spain, Las Médulas is the result of a Roman gold-mining technique called Ruina Montium (“wrecking of mountains”). Here is a video describing the process from IMAGEEN.

Finally, it’s interesting to know that it seems that a period of unusually warm weather, called the Roman Climactic Optimum, may have benefitted the Romans.