Global warming and climate change are terms for the observed century-scale rise in the average temperature of the Earth's climate system and its related effects. Multiple lines of scientific evidence show that the climate system is warming.Although the increase of near-surface atmospheric temperature is the measure of global warming often reported in the popular press,Most of it has melted ice and warmed the continents and atmosphere. Many of the observed changes since the 1950s are unprecedented over tens to thousands of years.
Since 1880, the average temperature has risen by 1.4-Fahrenheit degrees.
The last two decades of the 20th century have been hottest in the last 400 years, according to climate studies.
The Arctic is one of the worst places to be effected by global warming.
