Global warming is the long-term heating of Earth's climate system observed from the pre-industrial period since 1850 due to human activities and primarily fuel burning which increases the heat-trapping greenhouse gas levels in Earth's atmosphere.
Bioremediation is the use of microbes to clean up the contaminated soil and groundwater for purity. Microbes are very small organisms, such as bacteria, that live naturally in the environment and they are mostly used for cleaning purpose.