Global warming ‘slowed by pollution’

Climate scientist Andrew Weaver says variations from climate predictions relate to the rise of Asia and its higher air pollution rates

Oak Bay-Gordon Head MLA Andrew Weaver

The apparent slowing of global warming in recent years is likely due to effects of increased particulate and other conventional pollution, particularly from thermal coal use in Asia, says B.C. MLA and climate scientist Andrew Weaver.

Weaver was asked to respond to a report issued Thursday by University of Guelph environmental economist Ross McKitrick, a long-time critic of climate change models and a senior fellow at the Fraser Institute. Reviewing temperature data used by the Intergovernmental Panel on Climate Change, McKitrick notes that data for the last two decades have shown less warming than was predicted by most climate models.

McKitrick does not challenge the conclusion that human-generated carbon dioxide traps heat in the atmosphere. But he argues that the uncertain effect of rising emissions should cause policy-makers to wait for clarity before “making any irreversible climate policy commitments, in order to avoid making costly decisions that are revealed a short time later to have been unnecessary.”

Weaver questioned the accuracy of McKitrick’s report.

“To say that there’s no statistically significant change over the last 15 to 20 years, it’s just not true,” Weaver said. “2005 is the second warmest year on record, 2010 is the warmest, and we’re going to break the record in 2014 and set a new record.”

Weaver said climate models in the late 1990s estimated an amount of particulate and aerosol pollution in the world’s atmosphere that has been exceeded by growing thermal coal use in China and other emerging economies. That pollution has a cooling effect, and when air pollution is cleaned up it as it has been in North America, warming increases, he said.

“It doesn’t say anything about models or international policy,” Weaver said. “One thing we know is that China is going to clean up its air quality, because they have to.”

The issue is significant to B.C., where a carbon tax on fuels remains in place. Northeastern B.C.’s booming shale gas production, a cornerstone of the provincial government’s economic strategy, contains more CO2 than conventional gas, and it is extracted and vented to the atmosphere in processing for fuel or export.

Just Posted

Fire ban back in effect for Northwest Fire Centre region

Starting May 24, both Category 2 and Category 3 prohibitions will be in place

New Seven Sisters replacement confirmed

Mental health facility will have 25 beds, up from 20 in current facility

Convicted animal abuser to return to B.C. court May 21

Catherine Jessica Adams is facing a breach of probation charge

Healthcare travelling roadshow aims to inspire high school students across B.C

Over 2,000 youth in different rural communities will be visited through this project

Gallery: Project Heavy Duty inspires students into it’s 32nd year

The event is a collaboration between SD91 and industry in and around Vanderhoof, Fraser Lake and Fort St. James

600 new campsites coming to provincial parks and recreation sites across B.C.

Tourism Minister announced half of the new spots to 13 most popular provincial parks

Municipalities protest after B.C. declares marijuana growing ‘farm use’

UBCM president seeks answers in letter to John Horgan government

CMHC defends mortgage stress test changes amid calls for loosening rules

Uninsured borrowers must now show they could service their mortgage if rates rose two per cent

Nisga’a Nation tourism industry hits the road

First pilot tour to the Nass Valley is set for this summer with Indigenous Tourism BC

B.C. woman left ‘black and blue’ after being pushed off 40-foot cliff at lake

West Shore RCMP looking for witnesses as investigation continues

Thunderstorms to bring heavy rain, risk of flash floods in the southern Interior

Ten to 30 millimetres of rain to fall over the early weekend

Unbe-leaf-able: Agassiz man finds more than 200 four-leaf clovers in a month

Walt Hardinge has found more than 219 four-or-more leaf clovers this spring alone

Crews fight fire with fire to keep blaze from northern Alberta town

The wildfire now covers some 920 square kilometres

Man in B.C. charged with murder and arson in 2016 New Brunswick death

He is charged in the death of 71-year-old Lucille Maltais, who was found inside a burned down home

Most Read