The boreal forest encircles the Earth around and just below the Arctic Circle like a big carbon-storing hug. It can mostly be found covering large swathes of Russia, Canada and Alaska, and some Scandinavian countries.

In fact, the boreal — sometimes called by its Russian name 'taiga' or 'Great Northern Forest' — is perhaps the biggest terrestrial carbon store in the world.

So it's important to protect in a world where we're aiming for 1.5 or — at worst — under two degrees celsius of global warming.

"Our capacity to limit average global warming to less than 2 degrees is already highly improbable, so every possible mechanism to reduce emissions must be employed as early as possible. Maintaining and recovering our forests is part of that solution," Professor Corey Bradshaw, a leading researcher into boreal forests based at the University of Adelaide, told Energydesk.

It's not that tropical rainforests aren't important, but recent research led by Bradshaw published in Global and Planetary Change shows that that there is more carbon held in the boreal forests than previously realised.

But there's a problem.

As the climate changes one of the world's largest land-based sources of sequestering carbon could reach a 'tipping point' to become instead a net carbon source, releasing more CO2 than it stores, because of 'unprecedented' environmental changes brought about by a warming world.