‘Black carbon’ threat to Arctic as sea routes open up with global heating

theguardian.com:

In February last year, a Russian gas tanker, Christophe de Margerie, made history by navigating the icy waters of the northern sea route in mid-winter. The pioneering voyage, from Jiangsu in China to a remote Arctic port in Siberia, was heralded as the start of a new era that could reshape global shipping routes – cutting travel times between Europe and Asia by more than a third.

It has been made possible by the climate crisis. Shrinking polar ice has allowed shipping traffic in the Arctic to rise 25% between 2013 and 2019 and the growth is expected to continue.

But Arctic shipping is not only made possible by the climate crisis, it is adding to it too. More ships mean a rise in exhaust fumes, which is accelerating ice melt in this sensitive region due to a complex phenomenon involving “black carbon”, an air pollutant formed by the incomplete combustion of fossil fuels.

When black carbon, or soot, lands on snow and ice, it dramatically speeds up melting. Dark snow and ice, by absorbing more energy, melts far faster than heat-reflecting white snow, creating a vicious circle of faster warming.

Environmentalists warn that the Arctic, which is warming four times faster than the global average, has seen an 85% rise in black carbon from ships between 2015 and 2019, mainly because of the increase in oil tankers and bulk carriers.

The particles, which exacerbate respiratory and cardiovascular illness in towns, are short-term but potent climate agents: they represent more than 20% of carbon dioxide equivalent emissions from ships, according to one estimate.

Yet unlike other transport sectors, including road, rail and inland waterways, where air-quality standards curb emissions, no regulations exist for shipping. Last November, the