Multiple Choice

The concept of 'nudge theory' — the idea that small, carefully designed changes to the environment in which people make decisions can significantly influence their behaviour without restricting their freedom of choice — was popularised by behavioural economists Richard Thaler and Cass Sunstein in their 2008 book Nudge. The theory draws on decades of research in cognitive psychology and behavioural economics, which has demonstrated that human decision-making is systematically influenced by factors such as the framing of options, the order in which choices are presented, and the behaviour of others.

One of the most widely cited examples of nudge theory in practice is the use of default options. Research has consistently shown that people tend to stick with whatever option is presented as the default, regardless of whether it is in their best interest. This insight has been applied in a variety of policy contexts: in several countries, employees are automatically enrolled in pension schemes unless they actively choose to opt out. Studies have shown that this simple change can increase pension participation rates by 30 to 40 percentage points.

Nudge theory has also been applied to public health. In cafeteria settings, placing healthier food options at eye level has been shown to increase the consumption of healthy foods by up to 25% without any change in prices or restrictions on choice. Similarly, placing hand sanitiser dispensers at the entrance to hospital wards has been shown to increase hand hygiene compliance among healthcare workers.

Critics of nudge theory raise several concerns. Some argue that nudges are inherently paternalistic. Others question the durability of nudge effects: while nudges may produce short-term behaviour change, they may not lead to lasting changes in attitudes or habits. A further concern is that nudges may be less effective for individuals with lower levels of education or financial literacy, potentially exacerbating existing inequalities.

Despite these criticisms, nudge theory has been adopted by governments around the world. The United Kingdom established a Behavioural Insights Team in 2010, which has since been credited with saving the government hundreds of millions of pounds through interventions such as simplifying tax reminder letters and redesigning organ donation registration forms. Similar units have been established in the United States, Australia, and several European countries, reflecting the growing influence of behavioural economics on public policy.

The Arctic is warming at approximately four times the rate of the global average — a phenomenon known as Arctic amplification. This accelerated warming is driven by a self-reinforcing feedback loop: as sea ice melts, it exposes darker ocean water, which absorbs more solar radiation than the reflective ice it replaces, causing further warming and further ice loss. Since 1979, when satellite records began, Arctic sea ice extent has declined by approximately 13% per decade, and the Arctic Ocean is projected to experience its first ice-free summer before 2050.

The consequences of Arctic warming extend far beyond the region itself. The melting of the Greenland ice sheet — which contains enough ice to raise global sea levels by approximately 7 metres if it were to melt entirely — is accelerating. Current projections suggest that Greenland alone could contribute between 10 and 13 centimetres to global sea level rise by 2100 under high-emission scenarios. The thawing of Arctic permafrost — permanently frozen ground that covers approximately 25% of the Northern Hemisphere's land surface — is releasing stored carbon dioxide and methane.

Arctic warming is also affecting weather patterns in the mid-latitudes. Some scientists have proposed that the weakening of the polar vortex is causing the jet stream to become more wavy and erratic, leading to more frequent and prolonged extreme weather events. However, this hypothesis remains contested, and other researchers argue that the evidence for a link between Arctic warming and mid-latitude weather extremes is not yet conclusive.

The economic implications of Arctic change are complex and contested. On one hand, the melting of Arctic sea ice is opening new shipping routes — most notably the Northern Sea Route — that could significantly reduce shipping distances between Europe and Asia. The Arctic also contains vast untapped reserves of oil, natural gas, and minerals, which are becoming increasingly accessible as ice retreats.

International governance of the Arctic is managed primarily through the Arctic Council, an intergovernmental forum established in 1996 that includes the eight Arctic states. The Council has been credited with fostering scientific cooperation and environmental protection in the region, but its decisions are non-binding and it has no enforcement mechanisms.

The history of antibiotics is one of the most consequential chapters in the history of medicine. The discovery of penicillin by Alexander Fleming in 1928 — and its subsequent development into a practical medicine by Howard Florey and Ernst Chain in the early 1940s — transformed the treatment of bacterial infections. By the mid-twentieth century, antibiotics had become the cornerstone of modern medicine, enabling not only the treatment of infectious diseases but also the safety of surgical procedures, cancer chemotherapy, and organ transplantation.

The emergence of antibiotic resistance was recognised almost from the beginning. Fleming himself warned in his Nobel Prize acceptance speech in 1945 that the misuse of penicillin could lead to the selection of resistant bacteria. His warning proved prescient: within a decade of penicillin's widespread use, resistant strains of Staphylococcus aureus had emerged. Today, the World Health Organization estimates that drug-resistant infections cause approximately 700,000 deaths per year globally.

The primary drivers of antibiotic resistance are the overuse and misuse of antibiotics in both human medicine and agriculture. In human medicine, antibiotics are frequently prescribed for viral infections against which they are entirely ineffective. In agriculture, antibiotics are used extensively as growth promoters and to prevent disease in livestock, accounting for approximately 70% of global antibiotic consumption. Both practices create selective pressure that favours the survival and spread of resistant bacteria.

The development of new antibiotics has slowed dramatically in recent decades. The last truly novel class of antibiotics was discovered in the 1980s, and the pipeline of new drugs in development is widely regarded as inadequate. The primary reason for this slowdown is economic: antibiotics are typically taken for short courses and are expected to be sold at low prices, making them far less profitable for pharmaceutical companies than drugs for chronic conditions such as diabetes or heart disease.

International efforts to address antibiotic resistance have intensified in recent years. The Global Action Plan on Antimicrobial Resistance, adopted by the World Health Assembly in 2015, calls on all countries to develop national action plans, improve surveillance of resistance patterns, and reduce the unnecessary use of antibiotics. However, implementation has been uneven, and experts warn that without more ambitious global action, antibiotic resistance could cause 10 million deaths per year by 2050.