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Undeniable climate change facts

Glaciers are melting; sea levels are rising. And 20 of the hottest years on record have occurred since 1996. CNN's Jennifer Gray reports the facts about climate change.

Posted: Dec 5, 2018 1:44 PM
Updated: Dec 5, 2018 2:01 PM

Scientists are proposing an ingenious but as-yet-unproven way to tackle climate change: spraying sun-dimming chemicals into the Earth's atmosphere.

The research by scientists at Harvard and Yale universities, published in the journal Environmental Research Letters, proposes using a technique known as stratospheric aerosol injection, which they say could cut the rate of global warming in half.

The technique would involve spraying large amounts of sulfate particles into the Earth's lower stratosphere at altitudes as high as 12 miles. The scientists propose delivering the sulfates with specially designed high-altitude aircraft, balloons or large naval-style guns.

Despite the technology being undeveloped and with no existing aircraft suitable for adaptation, the researchers say that "developing a new, purpose-built tanker with substantial payload capabilities would neither be technologically difficult nor prohibitively expensive."

They estimate the total cost of launching a hypothetical system in 15 years' time at around $3.5 billion, with running costs of $2.25 billion a year over a 15-year period.

The report does, however, acknowledge that the technique is purely hypothetical.

"We make no judgment about the desirability of SAI," the report states. "We simply show that a hypothetical deployment program commencing 15 years hence, while both highly uncertain and ambitious, would indeed be technically possible from an engineering perspective. It would also be remarkably inexpensive."

The researchers also acknowledge potential risks: coordination between multiple countries in both hemispheres would be required, and stratospheric aerosol injection techniques could jeopardize crop yields, lead to droughts or cause extreme weather.

The proposals also don't address the issue of rising greenhouse gas emissions, which are a leading cause of global warming.

And despite the conviction of the report's authors, other experts were skeptical.

"From the point of view of climate economics, solar radiation management is still a much worse solution than greenhouse gas emissions: more costly and much more risky over the long run," said Philippe Thalmann of the École Polytechnique Fédérale de Lausanne, an expert in the economics of climate change.

David Archer of the Department of Geophysical Science at the University of Chicago said, "The problem with engineering climate in this way is that it's only a temporary Band-Aid covering a problem that will persist essentially forever, actually hundreds of thousands of years for fossil fuel CO2 to finally go away naturally.

"It will be tempting to continue to procrastinate on cleaning up our energy system, but we'd be leaving the planet on a form of life-support. If a future generation failed to pay their climate bill they would get all of our warming all at once."

Mississippi Coronavirus Cases

Data is updated nightly.

Cases: 473413

Reported Deaths: 9214
CountyCasesDeaths
Harrison32339474
Hinds30703575
DeSoto29814346
Jackson23263336
Rankin21111358
Lee14600217
Madison14043265
Jones13165218
Forrest12953233
Lauderdale11418297
Lowndes10249175
Lamar10048128
Pearl River8737209
Lafayette8078136
Hancock7324111
Washington6837147
Oktibbeha6820118
Neshoba6404201
Monroe6372158
Warren6326161
Pontotoc610393
Panola6071124
Bolivar6016143
Marshall5972118
Union564086
Pike5491133
Lincoln5232130
Alcorn520888
George457868
Scott451993
Leflore4401140
Prentiss437276
Itawamba436198
Tippah436180
Simpson4268111
Copiah425586
Wayne424863
Tate4234100
Adams4219114
Yazoo415886
Sunflower4088104
Covington407391
Marion4032100
Leake393185
Coahoma388198
Newton364474
Grenada3517101
Stone345657
Tishomingo324888
Attala321185
Jasper310262
Winston300391
Clay288273
Chickasaw282164
Clarke277487
Calhoun259739
Holmes259485
Smith243947
Yalobusha216747
Tallahatchie215649
Walthall205557
Greene204045
Lawrence203831
Perry196453
Amite193751
Webster191941
Noxubee174538
Montgomery169853
Jefferson Davis165541
Carroll159937
Tunica148434
Benton139433
Kemper137439
Claiborne125634
Choctaw124925
Humphreys123337
Franklin115227
Quitman101825
Wilkinson99835
Jefferson86632
Sharkey62120
Issaquena1916
Unassigned00

Alabama Coronavirus Cases

Cases: 768301

Reported Deaths: 13209
CountyCasesDeaths
Jefferson1093481727
Mobile699891179
Madison48418589
Baldwin35707452
Shelby35193291
Tuscaloosa33029512
Montgomery32582664
Lee21908204
Calhoun20140377
Morgan19351318
Etowah18583433
Marshall17272259
Houston16139353
St. Clair14956276
Limestone14129180
Cullman14069235
Elmore14010245
Lauderdale13128272
Talladega12399215
DeKalb11890229
Walker10231312
Autauga9493127
Blount9418149
Jackson9115136
Coffee8646161
Colbert8324169
Dale8284159
Escambia6456106
Tallapoosa6394168
Covington6313157
Chilton6243133
Russell591654
Franklin563597
Chambers5240132
Marion4628115
Dallas4626178
Clarke451471
Pike450091
Geneva4252106
Winston407987
Lawrence4046102
Bibb396177
Barbour338968
Marengo320981
Monroe311547
Butler309783
Pickens298769
Randolph294055
Henry293856
Hale286081
Cherokee279850
Fayette272271
Washington243545
Crenshaw232265
Clay221561
Macon214454
Cleburne209748
Lamar187839
Conecuh177139
Lowndes169056
Coosa163631
Wilcox154335
Bullock147142
Perry134235
Sumter123335
Greene119241
Choctaw72325
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Columbus
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Oxford
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Feels Like: 104°
Occasional areas of rain and some scattered thunderstorms will be in store for most of the weekend. However, good news by later sections of next week, as cooler and drier air will work its way into our weather forecast.
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