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: 315026

Reported Deaths: 7257
CountyCasesDeaths
DeSoto21684260
Hinds20385416
Harrison17973309
Rankin13650278
Jackson13456246
Madison10130217
Lee9988174
Jones8388163
Forrest7701152
Lauderdale7198240
Lowndes6411148
Lamar624686
Lafayette6210119
Washington5342134
Bolivar4804132
Oktibbeha463298
Panola4601107
Pearl River4524146
Marshall4454103
Warren4397121
Pontotoc421172
Monroe4120133
Union411276
Neshoba4033176
Lincoln3972110
Hancock380287
Leflore3500125
Sunflower336490
Tate335484
Pike3330105
Scott316773
Alcorn313670
Yazoo311870
Itawamba300877
Copiah297865
Coahoma295979
Simpson295388
Tippah289068
Adams288682
Prentiss280360
Marion269680
Leake268673
Wayne262941
Grenada261987
Covington260381
George249448
Newton246963
Winston227881
Tishomingo227567
Jasper221148
Attala214473
Chickasaw208457
Holmes189174
Clay185654
Stone183033
Tallahatchie179041
Clarke178180
Calhoun170932
Yalobusha164838
Smith162734
Walthall134345
Greene130633
Lawrence129324
Montgomery127242
Noxubee126734
Perry126338
Amite123142
Carroll121929
Webster114532
Jefferson Davis107233
Tunica105726
Claiborne102530
Benton100125
Humphreys96733
Kemper95828
Franklin83923
Quitman81116
Choctaw76418
Wilkinson67631
Jefferson65728
Sharkey50217
Issaquena1686
Unassigned00

Alabama Coronavirus Cases

Cases: 540267

Reported Deaths: 11038
CountyCasesDeaths
Jefferson798791529
Mobile41295809
Madison35175506
Tuscaloosa25932455
Shelby25309249
Montgomery24736593
Baldwin21422310
Lee15997172
Calhoun14577319
Morgan14431280
Etowah13927353
Marshall12280225
Houston10650282
Elmore10158206
Limestone10075151
St. Clair9955245
Cullman9773194
Lauderdale9465243
DeKalb8866188
Talladega8344176
Walker7261278
Autauga7010108
Jackson6840112
Blount6776139
Colbert6322135
Coffee5583118
Dale4878113
Russell445938
Chilton4383113
Franklin426382
Covington4138118
Tallapoosa4044153
Escambia395177
Chambers3598123
Dallas3569153
Clarke351561
Marion3140101
Pike312077
Lawrence303698
Winston275873
Bibb264864
Geneva254178
Marengo249865
Pickens234862
Barbour232056
Hale224078
Butler219069
Fayette213162
Henry190043
Cherokee184845
Randolph182542
Monroe178241
Washington167839
Macon161350
Clay157257
Crenshaw153657
Cleburne149641
Lamar143336
Lowndes140753
Wilcox127430
Bullock123342
Conecuh110829
Coosa109228
Perry107826
Sumter105032
Greene92634
Choctaw61024
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