Answer: A. Carbon footprint
Carbon footprint can be defined as the amount of carbon released as a gas in the atmosphere by particular human activity. The carbon dioxide and carbon monoxide are gases in the atmosphere, which are causing the increase in the temperature of the global climate. Human activities like deforestation, burning of fossil fuels and green house effect has led to the increase in the carbon gases in the atmosphere, resulting in global warming. Hence, carbon footprint should be considered for resolving the problem of global warming in the world.
