Average annual temperature of the Earth to the highest past 1998.08

According to the U.S. Oceanic and Atmospheric Administration, the average annual temperature of the Earth has risen since the 1980s, and 1997 has been a record high in the past, but in 1998 it tends to be hotter. The average temperature in the first half of 1998, compared with the average of about 120 years (1880 to 1997), was about 0.7 degrees C, and the previous maximum record was 0.3 degrees C at a stretch. The average temperature of the Earth is measured based on the observations of ground and sea levels around the world, and is about 17c in 1997.