But Jane Lubchenco, the administrator of NOAA, said the study found that the average temperature in the world had increased by 0.56° C (1° F) over the past 50 years. The rise "may seem small, but it has already altered our planet ... Glaciers and sea ice are melting, heavy rainfall is intensifying, and heat waves are more common."
International scientists have injected fresh evidence into the debate over global warming, saying that climate change is "undeniable" and shows clear signs of "human fingerprints" in the first major piece of research since the "Climategate" controversy.
Seven indicators were rising, he said. These were: air temperature over land, sea-surface temperature, marine air temperature, sea level, ocean heat, humidity, and tropospheric temperature in the "active-weather" layer of the atmosphere closest to the earth's surface.
Four indicators were declining: Arctic sea ice, glaciers, spring snow cover in the northern hemisphere, and stratospheric temperatures.Read more here