Cli­mate change is real

Down to Earth - - FACT SHEET -

The ev­i­dence

1 Each of the last three decades has been suc­ces­sively warmer. 1983-2012 was the warm­est 30-year pe­riod in 1,400 years in North­ern Hemi­sphere

2 Sur­face ocean (up­per 75 me­tres) warmed by 0.11 C per decade be­tween 1971 and 2010

3 Since the be­gin­ning of in­dus­trial era, CO2 emis­sions have led to ocean acid­i­fi­ca­tion. The pH of its sur­face wa­ter has de­creased by 0.1; acid­ity in­creased by 26%

4 Green­land and Antarc­tic ice sheets lost mass at a higher rate be­tween 2002 and 2011. North­ern Hemi­sphere spring snow cover de­creased in ex­tent; glaciers shrunk world­wide

5 Be­tween 1979 and 2012, Arc­tic sea-ice ex­tent de­creased by 3.5-4.1% per decade; Antarc­tic sea-ice ex­tent in­creased by 1.2-1.8% per decade. Antarc­tica wit­nessed strong re­gional dif­fer­ences, with sea-ice in­creas­ing in some re­gions and de­creas­ing in oth­ers

6 Mean sea level rose by 0.19 me­tre be­tween 1901 and 2010. It is the high­est rise in the last two mil­len­nia

7 Lim­it­ing warm­ing to less than 2 C rel­a­tive to 18611880 re­quires con­tain­ing emis­sions to 2,900 Gt of CO2. Nearly 1,900 Gt of CO2 was emit­ted by 2011

The pro­jec­tion

1 Sur­face tem­per­a­ture is pro­jected to rise in the 21st cen­tury un­der all pos­si­ble sce­nar­ios. Heat waves will oc­cur more of­ten and last longer. Ex­treme rain­fall events will be­come more in­tense and fre­quent in many re­gions. The ocean will con­tinue to warm and acid­ify, and global mean sea level will con­tinue to rise 2 Such changes will ob­vi­ously lead to­wards hot­ter cli­mate. There will be more fre­quent hot and fewer cold tem­per­a­ture ex­tremes on daily and sea­sonal time-scales as global mean sur­face tem­per­a­ture in­creases. Heat waves will oc­cur with a higher fre­quency and longer du­ra­tion. Oc­ca­sional cold win­ter ex­tremes will also con­tinue to oc­cur

Newspapers in English

Newspapers from India

© PressReader. All rights reserved.