A study published Monday in the journal Nature Climate Change suggests that more than a quarter of Earth’s land will become significantly drier even if the world manages to limit warming to the Paris Agreement goal of less than 2 degrees Celsius above pre-industrial levels. Limiting the temperature rise to the agreement’s more ambitious goal of 1.5 degrees Celsius could significantly reduce the amount of land affected.
“Our research predicts that aridification would emerge over about 20–30 percent of the world’s land surface by the time the global mean temperature change reaches 2 degrees C [Celsius],” said Manoj Joshi, study co-author from the University of East Anglia in the United Kingdom. “But two-thirds of the affected regions could avoid significant aridification if warming is limited to 1.5 degrees C.”
According to the study, the regions that would most benefit from keeping warming below 1.5 degrees Celsius are parts of South East Asia, Southern Europe, Southern Africa, Central America and Southern Australia.
The study authors used projections from 27 global climate models to identify the areas of the world where aridity will substantially change when compared to current year-to-year variations. With a temperature increase of 2 degrees Celsius, they found that between 24 percent and 32 percent of the Earth’s total land surface will become drier. At an increase of 1.5 degrees Celsius, only between eight percent and 10 percent of that surface becomes drier.
Aridification could dramatically increase the threat of widespread drought and wildfires. It is also a threat to agriculture, water quality and biodiversity, noted Chang-Eui Park, the study’s lead author from China’s Southern University for Sustainability and Technology.
Park likened the emergence of aridification to “a shift to continuous moderate drought conditions, on top of which future year-to-year variability can cause more severe drought. For instance, in such a scenario 15 percent of semi-arid regions would actually experience conditions similar to ‘arid’ climates today.”
Trump Administration Repeals Proposed Rules for Hydraulic Fracturing on Government Land
One day after a three-judge panel of the 10th U.S. Circuit Court of Appeals declined to reconsider it’s decision to overrule a lower court’s rejection of a proposed Obama-era rule regulating hydraulic fracturing on federal and Indian lands, the U.S. Department of the Interior’s Bureau of Land Management (BLM) rescinded the rule. Under the proposed rule, companies would have had to disclose the chemicals used in hydraulic fracturing, or fracking, whereby pressurized water is pumped underground to break open hydrocarbon deposits to increase well productivity.
The rule had been scheduled to go into effect in 2015, but it was never implemented due to court challenges by energy industry groups and several oil- and natural gas-producing states, which argued the rule was over-reaching and duplicative of state requirements, as well as by environmentalists, who pointed to a need to regulate potential risks to groundwater.
“This final rule is needed to prevent the unnecessarily burdensome and unjustified administrative requirements and compliance costs of the 2015 rule from encumbering oil and gas development on Federal and Indian lands,” BLM wrote in the 26-page final rule.
The move took effect immediately on December 29, skipping the 30-day waiting period often incorporated into rollbacks.
Vogtle Nuclear Project Gets Green Light
Georgia’s Public Service Commission has voted unanimously to allow construction of two nuclear reactors at Plant Vogtle to continue. Plagued by delays and escalating costs, the Vogtle reactors represent the only large-scale nuclear construction underway in the United States since abandonment of two reactors this summer by South Carolina Electric & Gas and Santee Cooper. This week, Dominion Power bought SCANA and assumed these failed South Carolina nuclear projectcosts.
“The decision to complete Vogtle 3 & 4 is important for Georgia’s energy future and the United States,” said Paul Bowers, chairman, president and CEO of Georgia Power, in a statement. “The Georgia Public Service Commission has shown leadership in making this complex and difficult decision and recognized that the Vogtle expansion is key to ensuring that our state has affordable and reliable energy today that will support economic growth now and for generations to come.”
Co-owned by Georgia Power, Oglethorpe Power, MEAG Power and Dalton Utilities, the reactors are presently scheduled to come online in 2021 (unit 3) and 2022 (unit 4).
The commission attached conditions to its approval of the Vogtle completion, including a lower return on equity for Georgia Power; more money returned to ratepayers; and the possibility of re-examining the project if Congress doesn’t extend a production tax credit for nuclear power past a 2021 expiration date.
The Climate Post offers a rundown of the week in climate and energy news. It is produced each Thursday by Duke University’s Nicholas Institute for Environmental Policy Solutions.