What ecological impact is caused by the use of energy?

SOS:

    Pollution and other problems such as health and environmental. ​Such energy sources as firewood, dried peat, coal, petroleum, natural gas, and water power, are considered by many scientists as fuels of the past. Their reasons for not listing these with energy fuels of the future are many. These sources are too small in supply. They do not produce enough energy to meet today's great energy needs. They cause pollution and health problems. They are a serious threat to the ecology of our world. Most of the energy consumed in the United States is produced from these sources. Garbage, solid wastes, and fuel crops may help with the pollution cleanup and with finding fuels to replace coal, oil, and petroleum. Scientists are studying ways to change city and agricultural wastes into petroleum.

Hope this helps!!

cockroaches and rats often are a symbol for things that are disgusting or vile. though i don't know which play you are talking about, i hope this !