Scientist says 'pie in the sky' engineering won't deal with climate change

Some scientists are warning against tackling climate change with major engineering projects.

Proposals to build a solar umbrella, or add fertiliser to oceans to take up more carbon dioxide, are deemed too costly and inefficient.

Professor David Karoly, of the University of Melbourne's School of Earth Sciences, says another 'pie in the sky' solution is to shoot sulfur particles in the atmosphere to shield the earth from the sun.

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