Benefit to cutting 'black carbon'

Cutting atmospheric soot, methane and ground-level ozone is the quickest way to tackle climate change in the short term, according to a new report.

The governing council of the UN Environment Programme (Unep) in Nairobi will hear that reducing these short-lived emissions could reduce warming by half a degree.

And it would be more easily achieved than reducing emissions of the gas principally implicated in long-term climate change, CO2.

It would also have spin-off benefits because soot and ground-level ozone harm human health - and ozone damages crops.

Loss adjustment

The assessment comes from Unep and World Meteorological Organization, in collaboration with a global team of scientists.

Its authors insist that nations must continue to strive to reduce CO2 emissions, which will continue to warm the atmosphere for more than 100 years from the time they are produced.

But it says that using existing technologies and institutions to cut ozone and black carbon (soot) can halve regional warming for 30 to 60 years whilst averting millions of premature deaths and avoiding tens of billions of dollars of crop losses annually.

Black carbon comes from the incomplete combustion of fossil fuels, mostly through diesel engines and biomass burning - including in cook stoves and brick kilns.

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