Some consequences of the increasing demand for energy are:

1. Air pollution, acid rain and health problems are caused by the burning of fossil fuels.
2. Large ecosystem is destroyed by dams which are built on rivers to generate electricity.
3. Living things are affected by radioactive emission of nuclear fuels which are used to generate electricity in nuclear power plant.

Steps to reduce energy consumption:

1. Non-renewable sources like fossil fuels should be used judiciously.
2. Renewable sources of energy should be used more.
3. Devices which take less energy like a pressure cooker should be used.