Where Climate and Lives Intertwine: John M’Cosh’s 1837 Assam

Where Climate and Lives Intertwine: John M’Cosh’s 1837 Assam through the Lens of Today’s Climate Crisis

ANJAN SARMA

In 1837, Scottish surgeon and author John M’Cosh published Topography of Assam, one of the earliest comprehensive geographic and environmental descriptions of the Brahmaputra Valley. Written long before modern meteorology or climate science, M’Cosh’s account captures an Assam defined by its seasonal cycles, its great rivers and their floods, its tremors beneath the earth, its jungles and wildlife, and the diseases that accompanied life in a moist tropical environment.

Where Climate and Lives Intertwine: John M’Cosh’s 1837 Assam through the Lens of Today’s Climate Crisis

Today, nearly two centuries later, his observations serve both as a historical baseline and a mirror: a landscape once shaped by rhythmic natural forces that is now confronting unprecedented climatic shifts and environmental stress.

M’Cosh began his environmental narrative by foregrounding Assam’s complex topography – a place where lowland plains, hills, and vast floodplains converge, and where water – in rain, river, and marsh – defines life itself. Long before scientific rainfall records, he noted how annual inundations transformed the valley, sometimes submerging rice fields and entire villages under floodwaters, forcing deer, buffalo, and even elephants to swim to higher grounds. Where yesterday maize and rice waved in the sun, by afternoon the same fields lay beneath muddy torrents. Roofs of homes sometimes peeked above floodwaters like islands amid inland seas. His eye for such seasonal inundation reads like the earliest modern reportage of Assam’s hydro-ecology.

When the Brahmaputra Still Had Room to Breathe: Reading John Butler’s 1855 Assam in the Age of Climate Crisis

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M’Cosh’s account also chronicles earthquakes as frequent occurrences – from July 1834 through April of the next year, he recorded a dozen separate shocks in the Goalpara region alone. These tremors, rumbling and sudden, were part of the lived environmental reality for early nineteenth-century Assamese, experienced as subterranean claps echoing through village life and landscape. Assam’s geological vitality, shaped by tectonic forces, remains equally relevant today; the region continues to be seismically active, with occasional strong quakes felt across the state.

Beyond geography and geological tremors, M’Cosh’s TOPGRAPHY delves into the health and climate relationship in intimate detail. His chapter on salubrity – the state’s relative healthiness – was informed by colonial medical concerns of the era: walls of swamp and jungle, stagnant pools, and the persistent influence of moisture bred what Europeans considered “unhealthy” climates, rife with fever and malaria.

M’Cosh painstakingly listed conditions like marsh-derived “sour air,” stagnant tanks, jungle neglect, and poor ventilation as predisposers of fever and poor health, long before germ theory or mosquito vectors were understood. This early environmental epidemiology highlights how climate, water, vegetation, and health were deeply entangled in Assam’s lived experience.

A Sketch of Assam (1847) Revisited: Historical Climate, Ecology, and the Riverine Soul of a Changing Land

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The impression one gets from M’Cosh’s Assam is of a land perpetually in dialogue with water – where rain, river, marsh, and fog were elemental forces. Seasons were less abstract than existential: monsoon rains could renew soil fertility or sweep away homes and crops; winter mists and fog mediated daily life; and summer heat, tempered by high humidity, shaped both human comfort and vulnerability. Modern science confirms that Assam’s climate remains fundamentally tropical-monsoon in character, with distinct four seasons that include a long rainy period driven by the southwest monsoon that brings the bulk of annual precipitation, and which historically has been the backbone of agriculture in the valley.

Yet the stability M’Cosh described – floods that were intense but part of a predictable cycle, foggy winters, and heat tempered by rain – is now giving way to a more volatile and unpredictable climate system. Contemporary climate analyses show that Assam’s average temperatures have risen over recent decades, with summer maxima often reaching near 38–39 °C and winter lows sometimes dipping below 8 °C – extremes that strain both human health and ecological balance. Rainfall patterns have become less predictable, with intense precipitation events interspersed with prolonged dry spells; such redistribution of rainfall undermines traditional cropping calendars that once relied on rhythmic monsoons and stable season lengths.

The rivers of Assam, especially the Brahmaputra and its tributaries, remain central to every environmental conversation. M’Cosh’s vivid imagery – fields submerged, cattle swimming between pastures separated by water, and homes known only by their roofs above the flood – anticipates what modern hydrologists describe as Assam’s inherently flood-prone geography. The Brahmaputra, flowing from the Tibetan plateau before entering the valley as a broad braided river, carries one of the highest sediment loads in the world. This natural condition, compounded today by climate change and anthropogenic pressures, ensures that flood events are pervasive experiences each monsoon season.

Modern flood events stand as stark reminders of this legacy. In 2020, exceptionally heavy monsoon rains – intensified by regional climate anomalies – led to floods across central and eastern Assam that affected millions of people and inundated large swathes of agricultural and habitation areas. What was once seasonal rhythm has, in recent decades, morphed into annual destruction with recurring human, economic, and ecological costs. Scientific studies attribute this to climate change patterns that increase the intensity of extreme rainfall events even as overall annual precipitation becomes less reliable.

What Butler and M’Cosh share – separated by decades of time and colonial perspective – is a profound sense that Assam’s climate and terrain are inseparable from its identity. But while Butler’s narrative captures rivers, jungles, and seasons in motion, M’Cosh’s account deepens that picture by linking environment with human health, settlement quality, and daily survival. His commentary on the unhealthiness of certain stations – where marshy winds carrying malaria were noted long before mosquito transmission was understood – reflects the complicated entanglement of climate and disease. Modern public health data confirms that high humidity, stagnant waters, and heat combine to create hotspots for waterborne and vector-borne diseases, illustrating how ecological conditions documented in the 1830s still carry relevance today.

The Climate of Assam in the Early 19th Century!

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Assam’s vegetation and biodiversity – described by M’Cosh as dense jungle interwoven with marsh and riverine grassland – have undergone significant transformation since the nineteenth century. While the state remains one of India’s richest in terms of species diversity, with forest ecosystems that compete with tropical rainforests elsewhere, large-scale deforestation, wetlands loss, and habitat fragmentation have disturbed ecological integrity. Protected areas such as Kaziranga and Manas now preserve remnants of what once was a far more continuous mosaic of habitat for wildlife including rhinoceros, elephants, deer, and myriad bird species.

In today’s context, the intersection of environment and climate has become inseparable from questions of sustainability and resilience. Assam’s farmers increasingly face uncertain rainfall timing and intensity, forcing shifts in planting calendars. Urban planners struggle with waterlogging and drainage issues as cities expand into low-lying flood plains. Health services encounter seasonally shifting disease patterns that echo the environmental observations of M’Cosh’s salubrity chapters but with added complications from heat stress and changing rainfall regimes.

What the Topography of Assam reveals, and what modern climate science confirms, is that Assam’s environment has always been dynamic, shaped by monsoon rhythms, riverine processes, geological activity, and human adaptation. But now, the pace and scale of change are unprecedented. Climate models predict increasing variability – heavier floods interspersed with more intense dry periods – and mounting pressure on agriculture, infrastructure, and biodiversity.

The Brahmaputra and its tributaries, which M’Cosh saw as life arteries carrying water and sediment through the valley, now also carry the burdens of climate change: unpredictable floods, eroding banks, and altered ecosystems. The marshes and wetlands that once functioned as natural buffers are shrinking. The jungles that once moderated temperature and moisture patterns are fragmented.

Yet, in the historical account of Assam’s seasons, floods, health, and forests, there lies also a reminder of resilience – of how communities once adapted to climatic variability and integrated ecological rhythms into the rhythms of life. Today, as Assam confronts intensified climate risks, those lessons from the past are not merely academic; they are foundational to planning for a future where environment and people once again move in sustainable dialogue.

Mahabahu Climate Forum

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