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Environment and nature

10 original practice questions. Open them in any order.

Independent preparation material, not an official IELTS test or score prediction.

Rewilding Peatlands: Restoring the Subterranean Carbon Vault

Paragraph A Peatlands encompass merely three percent of the planet's terrestrial landmass, yet they sequester more than twice the volume of carbon held across all global forest ecosystems combined. Formed over millennia through the incomplete decomposition of bryophytes, sedges, and woody debris in waterlogged, anaerobic environments, these subterranean deposits constitute one of Earth's most efficient biogeochemical sinks. However, extensive drainage schemes executed throughout the nineteenth and twentieth centuries—primarily intended to reclaim arable acreage and facilitate commercial silviculture—precipitated catastrophic degradation. Exposed to atmospheric oxygen, dormant microbial communities revived, metabolising previously inert organic compounds and discharging gigatons of carbon dioxide into the atmosphere.

Paragraph B In northern temperate zones, ecological restoration initiatives are pivoting toward large-scale re-wetting protocols. The foundational premise is hydrological restoration: by severing legacy drainage networks and erecting engineered ditch plugs composed of compressed peat, plastic piling, or local mineral soils, project managers deliberately elevate groundwater levels to within ten centimetres of the surface. Once hydric equilibrium is re-established, indigenous vegetation—most notably Sphagnum mosses—can colonise the surface once more. Sphagnum plays an indispensable role as an ecosystem engineer; its cellular architecture permits water retention equivalent to twenty times its dry biomass, while simultaneously releasing organic acids that inhibit competitor flora and suppress microbial decomposition.

Paragraph C Despite ecological triumphs, re-wetting operations encounter notable socioeconomic resistance from agricultural stakeholders. Landowners frequently contend that elevating hydrological baselines across contiguous reserves inadvertently waterlogs adjacent low-lying productive fields, rendering heavy mechanical cultivation unviable. To reconcile conservation imperatives with commercial viability, environmental economists have advanced the practice of paludiculture: commercial wet agriculture. By harvesting wetland-tolerant biomass crops such as common reed (Phragmites australis) for sustainable building insulation and cattail (Typha latifolia) for biocomposite packaging, rural enterprises can maintain revenue streams while preserving the structural and chemical stability of the underlying organic strata.

Paragraph D Nevertheless, the transition phase of peatland re-wetting carries environmental trade-offs that demand careful navigation. Immediately following inundation, the abrupt saturation of previously drained organic material frequently induces an acute, short-term spike in methane emissions. Methanogenic archaea proliferate rapidly in newly anaerobic, nutrient-rich superficial water layers, producing methane—a greenhouse gas with a global warming potential substantially higher than carbon dioxide over a centennial horizon. Long-term monitoring confirms, however, that this transitory flux generally subsides after two decades, eventually overtaken by the sustained net cooling effect of continuous carbon dioxide drawdown.

Question 1 of 10 · easier

True / False / Not Given

Do the following statements agree with the information given in the text? Choose TRUE if the statement agrees with the information, FALSE if the statement contradicts the information, or NOT GIVEN if there is no information on this.

Peatlands contain a greater volume of sequestered carbon than all forests across the globe combined.

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