8/15/2019 Feature - Climate Change

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8/15/2019 Feature - Climate Change

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Food

Water

Ecosystems

ExtremeWeather

Events

Risk of RapidClimate Changeand Major

Irreversible

Impacts

Rising crop yields in high-latitude developedcountries if strong carbon fertilization

Severe impactsin marginalSahel region

Falling crop yields in many developing regions

Rising number of people at risk fromhunger, with 1/2 of the increase in Africa and West Asia

Entire regions experience majordeclines in crop yields(up to 1/3 in Africa)

Yields in many developed regionsdecline even if strong carbon fertilization

Small mountain glaciersdisappear worldwide,potential threat to watersupplies in several areas

Significant changes in water availability

(e.g. more than a billion people sufferwater shortages in the 2080s, many inAfrica,while a similar number gain water)

Greater than 30% decreasein runoff in Mediterraneanand Southern Africa

Sea level rise threatensmajor world cities including

London, Shanghai, NewYork and Hong Kong

Coral reef ecosystemsextensively and eventuallyirreversibly damaged

Possible onset of collapseof part or all of Amazonrainforest

Large fraction of ecosystems unable to maintain current form

Many species face extinction

(20 50% in one study)

Rising intensity of storms, forest fires, droughts, flooding and heat waves

Small increases in hurricaneintensity lead to a doubling ofdamage costs in the U.S

Risk of weakening of natural carbon absorption and possible increasingnatural methane releases and weakening of the Atlantic THC

Onset of irreversible meltingof the Greenland ice sheet

Increasing risk of abrupt, large-scale shifts in the

climate system (e.g. collapse of the Atlantic THCand the West Antarctic Ice Sheet)

Eventual Temperature change(relative to pre-industial)

(c)WWF-Canon/MartinHARVEY

Source : Stern Review on the Economics of Climate Change

0 1 2 3 4 5

Food

Water

Ecosystems

ExtremeWeather

Events

Risk of RapidClimate Changeand Major

Irreversible

Impacts

Rising crop yields in high-latitude developed

countries if strong carbon fertilization

Severe impactsin marginalSahel region

Falling crop yields in many developing regions

Rising number of people at risk fromhunger, with 1/2 of the increase in Africa and West Asia

Entire regions experience majordeclines in crop yields(up to 1/3 in Africa)

Yields in many developed regionsdecline even if strong carbon fertilization

Small mountain glaciers

disappear worldwide,potential threat to watersupplies in several areas

Significant changes in water availability

(e.g. more than a billion people sufferwater shortages in the 2080s, many inAfrica,while a similar number gain water)

Greater than 30% decrease

in runoff in Mediterraneanand Southern Africa

Sea level rise threatensmajor world cities including

London, Shanghai, NewYork and Hong Kong

Coral reef ecosystemsextensively and eventuallyirreversibly damaged

Possible onset of collapseof part or all of Amazonrainforest

Large fraction of ecosystems unable to maintain current form

Many species face extinction

(20 50% in one study)

Rising intensity of storms, forest fires, droughts, flooding and heat waves

Small increases in hurricaneintensity lead to a doubling ofdamage costs in the U.S

Risk of weakening of natural carbon absorption and possible increasingnatural methane releases and weakening of the Atlantic THC

Onset of irreversible meltingof the Greenland ice sheet

Increasing risk of abrupt, large-scale shifts in the

climate system (e.g. collapse of the Atlantic THCand the West Antarctic Ice Sheet)

Stabilisation levels and probability ranges for temperature increases