Global warming

What is your p(doom)? This is the pseudo-scientific manner in which some people express the strength of their belief that an artificial superintelligence running on computers will, in the coming decades, kill all humans. If your p(doom) is 0.1, you think it 10 per cent likely. If your p(doom) is 0.9, you’re very confident it will happen. Well, maybe ‘confident’ isn’t the word. Those who have a high p(doom) and seem otherwise intelligent argue that there’s no point in having children or planning much for the future because we are all going to die. One of the most prominent doomers, a combative autodidact and the author of Harry Potter fan-fiction named Eliezer Yudkowsky, was recently asked what advice he would give to young people. He replied: ‘Don’t expect a long life.

Sharks were never far from our minds as we grew up on the beach in Adelaide. Although attacks were rare, they were real. My grandfather was witness to the fatal mauling of a swimming instructor in the 1930s, and later a friend from university was killed while scuba diving off Port Noarlunga. Yet for the most part sharks were more an idea than a living presence. Other than an unsettlingly close encounter with a bronze whaler when I was 20, my interactions with the creatures as a young person were mostly confined to observing gentle Port Jackson sharks, wobbegongs and grey nurses while snorkelling and diving. This tendency to see sharks only through the prism of their vastly overestimated threat to human life obscures the many wonders of these remarkable animals.

‘Walking by the banks of the Chao Praya on a breezy evening after a day of intense heat,’ writes Sunil Amrith at the start of his melancholic new book, ‘I struggled to connect the scene before me.’ While the river that flows through Bangkok looked idyllic, ‘crowded with noisy pleasure boats festooned with lights’, Amrith was struck by the realisation that half of the city ‘could be underwater by the end of this century’. This thought was the latest stage in a process that he says has taken him time to work out: ‘I can no longer separate the crisis of life on Earth from our concerns with justice and human freedom that inspired me to become a historian in the first place.

In the light of recent fire emergencies on the Greek islands and in the wider Mediterranean, this book has just acquired even more relevance. It centres on another catastrophe in May 2016, a Canadian inferno nicknamed the ‘Beast’, which has become the most expensive natural disaster in the country’s history. Within three weeks, Fort McMurray’s blaze had incinerated an area the size of Cumbria Within five days of its discovery, the blaze had forced the mass evacuation of 90,000 residents from the city of Fort McMurray in Alberta Province. In just three weeks, egged on by an El Niño cycle as well as fierce winds and record temperatures across America’s subarctic belt, it had incinerated an area equal to the county of Cumbria.

Covering 20 per cent of the Earth’s surface, the boreal forest is the largest living system, or ‘biome’, on land. It contains one third of all the planet’s trees and encircles much of the northern hemisphere in a halo of green. The northernmost extent of this forest, called the treeline, marks the point beyond which it is too cold for trees to grow. This is perhaps not where you’d expect to find Ben Rawlence, an author and journalist whose previous books have focused on humanitarian crises in Africa. But, as he explains in The Treeline, things are changing alarmingly fast in this biome: ‘The trees are on the move. They shouldn’t be. And this sinister fact has enormous consequences for all life on Earth.

‘I saw the best minds of my generation destroyed by cat videos,’ begins Henry Mance’s How to Love Animals, winningly. That is the paradox he sets out to unpick in this densely factual and intermittently horrifying book: how a world in thrall to cuteness, endlessly compelled to click on videos of kittens and owls having a special friendship, can remain indifferent to the suffering of almost all other animals, whether farmed, in captivity or in the wild. That’s a tough brief. I’m not sure it’s a book I would choose off the shelf, because the subject matter is deeply unpalatable.