The main gases responsible for the greenhouse effect include carbon dioxide, methane, nitrous oxide, and water vapor (which all occur naturally), and fluorinated gases (which are synthetic).
Greenhouse gases have different chemical properties and are removed from the atmosphere, over time, by different processes.
This hypothesis, or theory, that the enhanced greenhouse effect will cause Earth to heat up is called "global warming".
The best evidence to support this idea comes from studies of temperature and atmospheric gas concentrations in the past from ice core samples taken in Antarctica and Greenland.
Human Activity Is the Cause of Increased Greenhouse gas Concentrations.
Over the last century, burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2).
This increase happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.
Learn more about greenhouse effect here: