Renewable Energy - Part 1 - Global warming

Why use renewable energy? It is now officially recognized that the climate is changing as a result of the combustion of fossil fuels. While the full impact of global warming is not fully understood, it is expected that sea levels will rise over the coming millennia, perhaps as much as several meters. Some experts now consider this process to be irreversible, but still urge reduction in CO2 emissions, to limit further damage.