There is now a consensus among climate scientists that the burning of fossil fuels is causing an enhanced greenhouse effect. It is possible that there will be catastrophes such as destruction of the Amazon rainforest due to reductions in rainfall and loss of the Gulf Stream due to changes in the circulation of the Atlantic Ocean. There are three large-scale commercially traded forms of energy, namely nuclear energy, fossil fuels and solar energy. Nuclear energy from fission has severe problems relating to waste disposal, reactor accidents, nuclear weapons proliferation and nuclear terrorism.
Nuclear fusion is still many decades away from commercial utilisation.
Fossil fuels are the principal cause of the enhanced greenhouse effect and are subject to resource depletion, in addition to other problems. In addition to these three large sources of energy there is tidal and geothermal energy. These are available on a relatively small scale at a limited number of sites. In the case of tidal energy there is usually a major environmental impact associated with the construction of what amounts to a coastal hydro scheme. In addition, fossil fuels are used in the manufacture of plastics and other materials.