Without the greenhouse effect, Earth's average temperature would be near 0°F (or -18°C). Human activities – particularly burning fossil fuels – are increasing the concentrations of greenhouse gases. This increase is extremely likely to have been the dominant cause of the observed warming since the mid-20th century. Details: https://climate.nasa.gov/causes/ | NASA Climate Change

Scientists attribute global warming to the human expansion of the "greenhouse effect" — warming that results when the atmosphere traps heat radiating from Earth toward space: https://climate.nasa.gov/causes/ | NASA Climate Change

4.5K views · 118 reactions | Watch this video by the California Academy of Sciences which explains the greenhouse gas effect very simply and how climate change is threatening biodiversity through sea-level rise and warmer temperatures. | UN Climate Change | Facebook