The increase in greenhouse gases (GHGs) is primarily a result of
◦ the widespread consumption of fossil fuels with global industrialization
◦ the escape of GHGs from geothermal hot spots and active volcanoes
◦ increased sunspot activity that accelerates plant photosynthesis rates
◦ the release of excessive amounts of carbon from the warming of oceans
◦ widespread use of nitrogen-based chemical fertilizers in industrial agriculture