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Impact of Climate Change on Arab Countries - (IPCC) - Working ...

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ARAB ENVIRONMENT: CLIMATE CHANGE<br />

XI<br />

INTRODUCTION<br />

<strong>Arab</strong> Envir<strong>on</strong>ment:<br />

<str<strong>on</strong>g>Climate</str<strong>on</strong>g> <str<strong>on</strong>g>Change</str<strong>on</strong>g><br />

2009 Report <str<strong>on</strong>g>of</str<strong>on</strong>g> the <strong>Arab</strong> Forum for Envir<strong>on</strong>ment and Development (AFED)<br />

<str<strong>on</strong>g>Impact</str<strong>on</strong>g> <str<strong>on</strong>g>of</str<strong>on</strong>g> <str<strong>on</strong>g>Climate</str<strong>on</strong>g> <str<strong>on</strong>g>Change</str<strong>on</strong>g> <strong>on</strong> <strong>Arab</strong> <strong>Countries</strong><br />

Main Findings and C<strong>on</strong>clusi<strong>on</strong>s<br />

MOSTAFA K. TOLBA AND NAJIB W. SAAB<br />

Ours is a habitable planet because <str<strong>on</strong>g>of</str<strong>on</strong>g> a combinati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> c<strong>on</strong>diti<strong>on</strong>s c<strong>on</strong>genial to<br />

life. Earth’s climate is c<strong>on</strong>ducive to life because atmospheric greenhouse gas c<strong>on</strong>centrati<strong>on</strong>s,<br />

most notably CO2, trap a porti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> the sunlight reflected <str<strong>on</strong>g>of</str<strong>on</strong>g>f its surface,<br />

thereby warming the planet. Since the Industrial Revoluti<strong>on</strong> human activities<br />

– in particular, fossil fuel usage, land use patterns, agriculture and deforestati<strong>on</strong><br />

– have increased greenhouse gas c<strong>on</strong>centrati<strong>on</strong>s in the atmosphere, causing<br />

average temperatures to rise. That the climate is actually changing is now a globally<br />

accepted fact; even the few opp<strong>on</strong>ents who still deny that it is man-made<br />

agree that it is happening, but as a manifestati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> a natural cycle.<br />

By 2007, the Intergovernmental Panel <strong>on</strong> <str<strong>on</strong>g>Climate</str<strong>on</strong>g> <str<strong>on</strong>g>Change</str<strong>on</strong>g> (<strong>IPCC</strong>), the United<br />

Nati<strong>on</strong>s’ scientific body <strong>on</strong> the issue, stated with high certainty that human causes<br />

lay behind most <str<strong>on</strong>g>of</str<strong>on</strong>g> the observed global temperature increases. Atmospheric<br />

CO2 c<strong>on</strong>centrati<strong>on</strong>s have increased from approximately 280 ppm (parts per milli<strong>on</strong>)<br />

in the pre-industrial age to around 430 today. At the level <str<strong>on</strong>g>of</str<strong>on</strong>g> 550 ppm,<br />

which could be reached as early as 2035, global average temperatures may rise by<br />

more than 2°C. Under a business-as-usual (BAU) scenario, the stock <str<strong>on</strong>g>of</str<strong>on</strong>g> greenhouse<br />

gases could more than triple by the end <str<strong>on</strong>g>of</str<strong>on</strong>g> the century, giving at least a<br />

50% risk <str<strong>on</strong>g>of</str<strong>on</strong>g> temperatures rising by more than 5°C during the decades to follow.<br />

The scale <str<strong>on</strong>g>of</str<strong>on</strong>g> such an increase could be illustrated by the fact that the climate is<br />

presently 5°C warmer than in the last ice age, which was over 10,000 years ago.<br />

The amount <str<strong>on</strong>g>of</str<strong>on</strong>g> carb<strong>on</strong> held in the oceans has increased, causing gradual but<br />

steady acidificati<strong>on</strong> that threatens marine ecosystems. Warmer water temperatures<br />

have also caused much coral bleaching. Increasing average temperatures<br />

have steadily caused melting <str<strong>on</strong>g>of</str<strong>on</strong>g> ice in the polar regi<strong>on</strong>s as well as <str<strong>on</strong>g>of</str<strong>on</strong>g> glaciers<br />

around the world. Warming ocean waters may cause the sea level to rise by up to<br />

59 cm by 2100 according to <strong>IPCC</strong> 2007 estimates, or even up to 5 metres if the<br />

melting <str<strong>on</strong>g>of</str<strong>on</strong>g> the Antarctic ice sheet is taken into c<strong>on</strong>siderati<strong>on</strong>.<br />

The <strong>IPCC</strong> predicts that 20 to 30% <str<strong>on</strong>g>of</str<strong>on</strong>g> species will be made extinct if the temperature<br />

increases by more than 1°C, which is already virtually unavoidable.<br />

Extreme weather events and variability will also likely to ensue.

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