Painting buildings and roads white could help us beat extreme heat—30 January 2018

New research funded by the Australian Research Council (ARC) and published in Nature Geoscience, has found that climate engineering by modifying the properties of the land surface in highly populated areas and agricultural areas over North American, Europe and Asia could reduce extreme temperatures there by up to 2–3°C.

The modifications could include lightening buildings, roads and other infrastructure in high population areas and changing crops and engaging in no-till agricultural practices.

Unlike many other climate-engineering methods proposed to tackle climate change, many of these regional modifications have already been tested and proven to work. Critically, this method has fewer risks compared with injecting aerosols into the atmosphere.

“Extreme temperatures are where human and natural systems are most vulnerable. Changing the radiative properties of land helps address this issue with fewer side effects,” said Director of the ARC Centre of Excellence for Climate Extremes, Professor Andy Pitman.

“This research suggests that by taking a regional approach, at least in temperate zones, policy and investment decisions can be pragmatically and affordably focused on areas of greatest need.”

By contrast other proposed forms of large-scale climate engineering, such as spraying sulphate aerosols into the atmosphere, fertilising the ocean with iron and even building giant mirrors in space, have questionable effectiveness and are likely to alter climate systems in unexpected ways.  They could make situations worse for some countries.

The researchers gained their results by modelling how changing only the radiative properties of agricultural land and high population areas across North America, Europe and Asia would impact average temperatures, extreme temperatures and precipitation.

The results showed small impacts on average temperatures, little change in precipitation—except in Asia—but significant reductions in extreme temperatures.

Media Issued by the ARC Centre of Excellence for Climate Extremes.


Image: New research has found that climate engineering by modifying the properties of the land surface, such as by painting buildings white, could reduce extreme temperatures there by up to 2-3°C.
Source: Pxhere.

Original Published Date: 
Tuesday, January 30, 2018