Select the correct answer from each drop-down menu. Which transitions show the correct relationships?

Global Warming and Its Causes

Global warming is a result of an increase in greenhouse gases. Greenhouse gases are released into the atmosphere

deforestation and combustion of fossil fuels.

Deforestation is a major contributor to global warming. Forests help to maintain the levels of oxygen in the air that make it possible

for us to survive.

, there has been a surge in the levels of carbon dioxide in the air

the depletion of vast

stretches of forests.

other factors, such as the release of CFCs from refrigerators and pollutants from industries into the

atmosphere, are also responsible for global warming,