IELTS vocabulary: the Environment

Environment shows up constantly on the test: Task 2 prompts about climate change, pollution, or conservation; Part 3 discussions that follow almost any Part 2 cue card about nature, travel, or your hometown; General Training letters about a local environmental issue affecting your street or building. The problem isn't that candidates don't know environmental words — most people can say "pollution" and "climate change" without hesitation. The problem is that those two phrases end up doing all the work in an essay that needed fifteen or twenty more precise terms, and an examiner scoring Lexical Resource notices the repetition within the first paragraph. This article works through the vocabulary in the shape an actual essay needs it: causes, effects, solutions, the pairs of words candidates genuinely confuse, and then how to actually deploy all of it without the essay reading like a word list.

Start with causes, because a surprising number of essays skip straight to effects without naming what's actually driving them — a body paragraph that opens with "climate change is getting worse" and never says why reads as assertion, not argument. "Deforestation" is the large-scale clearing of forest, usually for agriculture, logging, or urban expansion — not the same as "desertification," which is land degrading into desert-like conditions, often from a mix of drought and overuse rather than deliberate clearing. "Greenhouse gas emissions" is the umbrella term for the actual gases (carbon dioxide, methane, nitrous oxide) trapping heat in the atmosphere; "carbon emissions" is a common shorthand that's slightly less precise but still band-appropriate for most essays. "Fossil fuel dependency" names the underlying structural cause behind most emissions figures — an essay that only says "emissions are high" scores lower than one that explains dependency on coal, oil, and gas as the reason. "Industrial pollution" covers contamination from manufacturing and factories specifically, distinct from "agricultural runoff" (fertiliser and pesticide chemicals washing into rivers and groundwater) and "overexploitation of natural resources" (extracting a resource — fish stocks, groundwater, timber — faster than it can replenish). "Urban sprawl" is worth knowing for essays connecting environmental damage to city growth: the uncontrolled spread of low-density development into surrounding countryside, distinct from "urbanisation" itself, which just means population shifting into cities and isn't inherently negative.

Effects split into two useful sub-groups, and most candidates only ever write about the first. Physical effects include "rising sea levels," "extreme weather events" (the standard umbrella term covering droughts, floods, and storms attributed to a changing climate — always plural, never "an extreme weather"), "ocean acidification" (seawater becoming more acidic as it absorbs excess carbon dioxide, a term examiners rarely see but that instantly signals genuine topic knowledge), and "habitat destruction," which is the direct physical loss of an ecosystem, as distinct from the next term. "Biodiversity loss" refers specifically to a shrinking variety of species across an ecosystem or the planet as a whole — use it when your point is about the range of life disappearing, not simply about pollution or damage in general — while "species extinction" is the more extreme, specific endpoint of that same trend for a single species. "Water scarcity" (an inadequate, unreliable supply of fresh water for a population) is increasingly its own Task 2 topic but also functions as an effect of broader environmental change.