Climate change and human health concerns are linked to anthropogenic greenhouse gases and aerosols. Human activities (most notably the combustion of fossil fuels) have significantly increased the concentration of greenhouse gases in the Earth's atmosphere, resulting in global warming. Oil, natural gas, and coal are examples of fossil fuels that are burned to generate energy. This energy is used to produce electricity, as well as to power transportation (such as vehicles and planes) and industrial processes. The use of fossil fuels is the principal driver of contemporary climate change, which is disrupting Earth's ecosystems and posing health risks to humans and the environment. Faced with the truth of human-caused global warming, we must now seek measures to mitigate the situation so that future generations are not left with a calamity. Biofuels appear to have no net carbon dioxide emissions.