13K views · 419 reactions | 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 | Facebook

23K views · 1K reactions | Carbon dioxide is the most important...