How do human activities change Earth's air, water, land and living systems?
Explain how human activities (pollution, deforestation, land use, resource extraction) affect Earth's atmosphere, hydrosphere, geosphere and biosphere, and evaluate ways to reduce harm.
A Regents answer on human impact: how pollution, deforestation, land use and resource extraction affect the atmosphere, hydrosphere, geosphere and biosphere, examples such as air and water pollution, soil erosion and habitat loss, the idea of Earth's interconnected systems, and how to evaluate solutions, for the Earth and Space Sciences exam, with worked exam questions.
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What this topic is asking
The Regents (and especially the new Earth and Space Sciences exam under ESS3) wants you to explain how human activities affect Earth's four interconnected systems, the atmosphere, hydrosphere, geosphere and biosphere, and to evaluate ways to reduce harm. The key idea is that the systems are connected, so an impact on one spreads to the others.
Earth's interconnected systems
How human activities affect each system
Tracing impacts across systems
Because the spheres are connected, impacts spread. A few classic chains the Regents uses:
- Burning fossil fuels (atmosphere) adds carbon dioxide, which warms the climate, which melts ice and raises sea level (hydrosphere) and shifts habitats (biosphere).
- Fertilizer runoff (geosphere to hydrosphere) over-feeds algae in a lake; the algae die and decompose, removing oxygen and killing fish (biosphere).
- Clearing a forest (biosphere/geosphere) increases erosion, which clouds rivers (hydrosphere) and reduces carbon uptake (atmosphere).
Recognizing these links is exactly the kind of cross-system reasoning the new exam rewards.
Evaluating solutions
The exam often asks you to propose or evaluate an action to reduce harm. Strong answers name a realistic measure and tie it to the system affected: treating wastewater before release (protects the hydrosphere), regulating and filtering emissions (protects the atmosphere), replanting and protecting forests (reduces erosion and restores carbon uptake), conserving and recycling resources (reduces extraction), and switching to renewable energy (reduces carbon dioxide).
Try this
Q1. Name Earth's four interconnected systems. [2 points]
- Cue. Atmosphere, hydrosphere, geosphere and biosphere.
Q2. Explain one way deforestation affects more than one Earth system. [2 points]
- Cue. Removing trees increases soil erosion (geosphere), reduces carbon dioxide uptake (atmosphere) and destroys habitats (biosphere), so it affects several systems at once.
Exam-style practice questions
Practice questions written in the style of NYSED exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Regents (style)1 marksPart A. Clearing a large forest for farmland will most likely increase (1) the rate of soil erosion (2) the stability of the soil (3) the amount of carbon dioxide removed from the air (4) the number of habitats. Justify your choice.Show worked answer →
A 1-point multiple-choice question. The answer is (1).
Removing the trees and their roots exposes the soil to wind and rain, so deforestation increases the rate of soil erosion. It decreases soil stability (2), decreases carbon dioxide removal because fewer trees photosynthesise (3), and reduces the number of habitats (4). The trap is choosing a "benefit"; the dominant Earth-systems effect of clearing a forest is more erosion (and less carbon uptake and habitat).
Regents (style)3 marksPart C. (a) Identify which Earth system is most directly affected when factories release pollutants into a river. (b) Explain how that pollution can affect a second Earth system. (c) Describe one action that would reduce the harm.Show worked answer →
A 3-point extended-response question.
(a) 1 point: the hydrosphere (the river and its water).
(b) 1 point: a valid knock-on effect, for example the polluted water harms the biosphere (fish and other organisms die or accumulate toxins), or it seeps into groundwater (also hydrosphere/geosphere), or contaminated water affects soil and crops (geosphere/biosphere).
(c) 1 point: a valid mitigation, for example treating wastewater before release, regulating and monitoring discharges, or using cleaner production methods.
Markers reward naming the hydrosphere, a correct cross-system effect (showing the systems are interconnected), and a realistic action to reduce harm.
Related dot points
- Explain the greenhouse effect and the role of greenhouse gases, distinguish natural from human-enhanced climate change, and describe the evidence for and consequences of recent global warming.
A Regents answer on the greenhouse effect and climate change: how greenhouse gases (carbon dioxide, methane, water vapor) trap outgoing infrared energy and warm the surface, natural versus human-enhanced warming from burning fossil fuels, the evidence (rising carbon dioxide and temperature, melting ice, rising seas) and consequences, with worked exam questions.
- Describe how carbon cycles among the atmosphere, biosphere, hydrosphere and geosphere through photosynthesis, respiration, decomposition and combustion, and explain how human activities alter the carbon cycle.
A Regents answer on the carbon cycle: how carbon moves among the atmosphere, biosphere, hydrosphere and geosphere through photosynthesis, respiration, decomposition and combustion, the role of carbon sinks (oceans, forests, fossil fuels), and how burning fossil fuels and deforestation move stored carbon into the air, with worked exam questions.
- Describe Earth's key natural resources (water, soil, minerals, air, forests) and explain how resource management, conservation and sustainability balance human needs against the limits of Earth's systems.
A Regents answer on natural resources and management: the difference between renewable and non-renewable resources, the key resources (fresh water, fertile soil, minerals, air, forests), the meaning of conservation and sustainability, why resources are unevenly distributed, and how management balances human needs against Earth's limits, with worked exam questions.
- Distinguish renewable from non-renewable energy resources, describe the main sources (fossil fuels, nuclear, solar, wind, hydro, geothermal) and weigh their advantages and environmental costs.
A Regents answer on energy resources: the difference between renewable and non-renewable resources, the main sources (coal, oil and gas, nuclear, solar, wind, hydroelectric, geothermal), how fossil fuels form over geologic time, and the advantages and environmental costs of each for the Earth and Space Sciences exam, with worked exam questions.
- Describe major natural hazards (earthquakes, volcanoes, severe weather, floods) and explain how forecasting, monitoring and preparedness use Earth science to reduce their impact on society.
A Regents answer on natural hazards and society: the main geologic and weather hazards (earthquakes, volcanoes, hurricanes and severe storms, floods), why they cluster in certain places, and how Earth science (forecasting, monitoring, hazard maps, warning systems and preparedness) reduces their impact, for the Earth and Space Sciences exam, with worked exam questions.
Sources & how we know this
- Earth and Space Sciences — New York State Education Department (2026)
- Regents Examination in Physical Setting/Earth Science — New York State Education Department (2026)