Is geoengineering a lot of hot air?

Joel Adriano
South-East Asia & Pacific regional coordinator, SciDev.Net

Geoengineering was described as a “pretty scary” idea by scientists who have been assessing its ramifications said Ben Kravitz, Carnegie Institute for Science. He has been studying the idea of mimicking the cooling effect of  large volcanic eruptions on climate. This could be done by continually pumping sulphates into the atmosphere to reflect sunlight away from earth.

Could we mimic this volcano?

He tested two scenarios — releasing suphates at the lowest layer, the troposphere, or the highest,  into space. Both cases carried the risk of serious unintended consequences.

Geoengineering is a highly controversial concept since it involves large-scale deliberate manipulation of the planet to remove greenhouse gases in the atmosphere and mitigate global warming. Some of the techniques, such as solar radiation management, are meant to reduce the warming effects of carbon dioxide.

Kravitz said the first idea, put forward in 1977, was to pump carbon dioxide into the deep ocean.

Colin Axon, of Brunel University in the UK, explained that issues included cost (energy, people and investments), materials, process, water and space (land and distribution).

Margaret Torn, head of the Climate and Carbon Sciences Program at Berkeley National Laboratory, US, who studied carbon carbon dioxide removal by terrestrial ecosystems, found that the disadvantages outweighed the advantages if the landscape was altered, for example by intensively planting trees where there used to be none.

But, she said the study showed that “there can be ways to manage land to increase carbon sequestration”.

“There are lots of grey areas in geoengineering” — and so far she said, very few researchers have actually came up with compelling research.

This blog post is part of our Planet Under Pressure 2012 coverage — which takes place 26–29 March 2012. To read news and analysis from the conference please visit our website.

One Response to Is geoengineering a lot of hot air?

  1. sirosser says:

    Interesting article. If you fancy an action-thriller, with geoengineering theme, try TIPPING POINT. Just a thought! Cheers.

Comments closed. Read our blogs at

Please log in using one of these methods to post your comment: Logo

You are commenting using your account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: