Though warming has not been uniform across the planet, the upward trend in the globally averaged temperature shows that more areas are warming than cooling. Since 1976, every year including 2015 has had an average global temperature warmer than the long-term average. Over this 38-year period, temperature warmed at an average of 0.50 °F (0.28 °C) per decade over land and 0.22 °F (0.12 °C) per decade over the ocean.
For the last 50 years, global temperature rose at an average rate of about 0.13°C (around one-quarter degree Fahrenheit) per decade—around twice as fast as the 0.06°C per decade increase observed over the previous half-century. In the next 20 years, scientists project that global average temperature will rise by around 0.2°C (about one-third of a degree Fahrenheit) per decade