Having a flutter: a lack of food for butterfly larvae has eaten into numbers. Photo: Getty
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Butterflies are beautiful but we need to love their larvae too

The numbers of monarch butterflies are at a record low and a large part of this is because of the disappearance of the milkweed plant, eaten by caterpillars.

Sometimes, to prove a point, you have to starve a larva. It’s all too easy to be bewitched by the beauty of a passing butterfly but not so easy to admire the foraging of a voracious caterpillar. We should, though: it turns out that the two are linked.

Researchers in the US have been putting monarch butterfly larvae on strict diets and observing the consequences for the butterflies they become. This kind of butterfly is in grave trouble. Every year, the insects perform an extraordinary 3,000-mile migration from Canada and the northern US down to central Mexico, where they gather on a few mountaintops for the winter.

In 2012, about 60 million monarchs arrived in the Mexican mountains. That was a record low until the 2013 figures came in – the number arriving was almost half that of the previous year. It was the lowest figure since records began in 1993.

A big problem is the widespread disappearance of the milkweed plant. Monarch larvae eat only milkweed and urbanisation and industrial farming practices have made it scarce.

Hence the research, which was published last April. The researchers found that restricting the monarch larva’s milkweed intake reduces the size of its wings when it emerges from the chrysalis. It is likely that this stunted growth makes the migration much harder work.

Monarchs also seem to need food to maintain their looks. The colours of the orange-and-black wing patterns are deeper, with more striking contrast, in monarchs covering the most distance. It may be that feeding up the larvae to produce better fliers will also produce more beautiful butterflies.

The aesthetic argument is one of very few available to conservationists. Researchers can’t point to any specific benefit that monarchs bring: they don’t seem to play a crucial role in any ecosystem and their removal from specific ecosystems “would probably not have lasting repercussions”, as one report put it. The monarchs don’t contribute anything apart from a beautiful spectacle when they migrate.

British butterflies are even worse off – they don’t have a spectacular migration. In March, the UK government issued a draft of its “pollinator strategy” document, which outlines what might be done about the severe decline in numbers of pollinating insects such as bees, butterflies and moths. The charity Butterfly Conservation said that it “strongly welcomes” the proposed strategy (though it dismisses as “ludicrous” the idea that pesticide companies should self-regulate).

Yet there is a slightly dejected tone to the charity’s chief executive’s observations. He points out that while bees are acknowledged to have economic value as pollinators of agricultural crops, butterflies are not and are therefore less likely to receive government help. In the age of market forces, it is not enough to be beautiful.

However, as the Intergovernmental Panel on Climate Change noted in March, butterflies’ relatively short life cycle and “high dispersal capacity” make them very useful markers of climate change.

That is certainly true of the British butterfly population, which, apart from a few cold-loving species, is thriving in our warming climate. In the past 20 years, for instance, the orange-and-black comma butterfly has spread 137 miles northwards.

If you lived in Edinburgh in the early 1990s, you would not have seen one. Now they’re not an uncommon sight: an effect of global warming that’s hard to complain about.

Michael Brooks holds a PhD in quantum physics. He writes a weekly science column for the New Statesman, and his most recent book is At the Edge of Uncertainty: 11 Discoveries Taking Science by Surprise.

This article first appeared in the 14 April 2014 issue of the New Statesman, Easter Double

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The Jewish lawyers who reinvented justice

Two new books explore the trials of Nazis – and asks how they changed our conception of justice.

In August 1942, Hans Frank, Hitler’s lawyer and governor general of occupied Poland, arrived in Lvov. “We knew that his visit did not bode well,” a Jewish resident later recalled. That month, writes Philippe Sands, Frank gave a lecture in a university building “in which he announced the extermination of the city’s Jews”.

Frank and other leading Nazis were tried at Nuremberg after the war. It was, writes Sands, “the first time in human history that the leaders of a state were put on trial before an international court for crimes against
humanity and genocide, two new crimes”.

For Sands, this is the story of some of the great humanitarian ideas of the 20th century. A T Williams, however, is more sceptical. For him, the search for justice after 1945 was a wasted opportunity. “It began,” he writes, “as a romantic gesture. And like any romance and like any gesture, the gloss of virtue soon fell away to reveal a hard, pragmatic undercoat.” Did the trials of 1945 and beyond provide any justice to the victims? How many more deaths and tortures were ignored and how many perpetrators escaped?

Together these books ask important questions. Were the trials and the new legal ideas – international human rights, war crimes, genocide – among the crowning achievements of our time, the foundations of how we think about justice today? Or were they, as Williams concludes, “an impersonal and imperfect reaction to human cruelty and human suffering”?

Williams won the Orwell Prize for political writing in 2013 for A Very British Killing: the Death of Baha Mousa. His new book reads as if it were several works in one. Each chapter begins with the author visiting the remains of a different Nazi concentration camp – intriguing travelogues that might have made a fascinating book in their own right. He then looks at what happened in these camps (some familiar, such as Buchenwald and Dachau; others barely known, such as Neuengamme and Neustadt). The single reference to Nikolaus Wachsmann’s KL: a History of the Nazi Concentration Camps, published last year, suggests that it came out too late for Williams to use.

A Passing Fury starts with an atrocity at Neuengamme, near Hamburg, where, in the last days of the war, the concentration camp’s inmates were put to sea by Nazis in the knowledge that they would almost certainly be killed by Allied bombers. Williams buys a pamphlet at the visitors’ centre on the site of the camp. It informs him: “Almost 7,000 prisoners were either killed in the flames, drowned or were shot trying to save their lives.” His interest in the subsequent trial leads him to look at other Nazi trials after the war. His central argument is that these were not a victory for rational and civilised behaviour – the widespread assumption that they were, he writes, is simply a myth.

Williams has plenty of insights and is especially good on the Allies’ lack of manpower and resources in 1945. There was also enormous pressure on the prosecutors to gather information and go to trial within a few months. The obstacles they faced were huge. How to find witnesses and make sure that they stayed for the trials, months later, when they were desperate to be reunited with their families or to find safety in Palestine or the US?

The lawyers also felt that they were “operating in a legal void”. These crimes were unprecedented. What should the SS men and women be charged with? “They needed new terms,” writes Williams, “a completely fresh language to express the enormity of all that they were hearing.” This is exactly what the Jewish lawyers Hersch Lauterpacht and Raphael Lemkin, who play major roles in Sands’s book, were providing – but they are almost completely absent here.

Williams is also troubled by what he sees as flaws in the British legal system. Defence lawyers focused ruthlessly on the inconsistencies of witnesses, forcing them to recall the most terrible ordeals. One particularly devastating account of a cross-examination raises questions about the humanity of the process. The disturbing statements of British lawyers make one wonder about their assumptions about Jews and other camp inmates. “The type of internee who came to these concentration camps was a very low type,” said Major Thomas Winwood, defending the accused in the Bergen-Belsen trial. “I would go so far as to say that by the time we got to Auschwitz and Belsen, the vast majority of the inhabitants of the concentration camps were the dregs of the ghettoes of middle Europe.”

Williams has put together an original polemic against our assumptions about these trials, including those at Nuremberg. Sands, a leading lawyer in the field of war crimes and crimes against humanity, presents a completely different view of Nuremberg and the revolution in justice it introduced. His is a story of heroes and loss.

Lvov is at the heart of Sands’s book. Now in Ukraine, the city changed hands (and names) eight times between 1914 and 1945 – it is known today as Lviv. This is where his grandfather Leon Buchholz was born in 1904. Leon had over 70 relatives. He was the only one to survive the Holocaust.

In 1915, Hersch Lauterpacht came to Lvov to study law. He became one of the great figures in international law, “a father of the modern human rights movement”. Six years later, in 1921, Raphael Lemkin also began his law studies in Lvov; in 1944, he coined the term “genocide” in his book Axis Rule in Occupied Europe.

Both Lauterpacht and Lemkin, like Leon, lost members of their family during the Nazi occupation of Poland. Sands interweaves the stories of these three Jews and how their lives and their ideas were affected by what happened in Lvov. This is an important question. We forget how many of the greatest films, works and ideas of the postwar period were profoundly affected by displacement and loss.

East West Street is an outstanding book. It is a moving history of Sands’s family and especially his grandparents but, at times, it reads like a detective story, as the author tries to find out what happened to his relatives, tracking down figures such as “Miss Tilney of Norwich”, “the Man in a Bow Tie” and “the Child Who Stands Alone” – all involved in some way in a mystery surrounding the author’s mother and her escape from pre-war Vienna. But Sands’s greatest achievement is the way he moves between this family story and the lives of Lauterpacht and Lemkin and how he brings their complex work to life.

There is a crucial fourth figure: Hans Frank, the Nazi lawyer who was responsible for the murder of millions. Sands uses his story to focus his account of Nazi war crimes. Frank was brought to justice at Nuremberg, where Lauterpacht and Lemkin were creating a revolution in international law. Lauterpacht’s emphasis was on individual rights, Lemkin’s on crimes against the group.

This is the best kind of intellectual history. Sands puts the ideas of Lemkin and Lauterpacht in context and shows how they still resonate today, influencing Tony Blair, David Cameron and Barack Obama. When we think of the atrocities committed by Slobodan Milosevic or Bashar al-Assad, it is the ideas of these two Jewish refugees we turn to. Sands shows us in a clear, astonishing story where they came from. 

This article first appeared in the 19 May 2016 issue of the New Statesman, The Great Huckster