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Explore the Impact of Humans on Biodiversity

In this worksheet, students will explore the importance of maintaining biodiversity and look at how humans have impacted global environments.

'Explore the Impact of Humans on Biodiversity' worksheet

Key stage:  KS 4

Year:  GCSE

GCSE Subjects:   Biology: Single Subject, Biology: Combined Science,

GCSE Boards:   OCR 21st Century

Curriculum topic:   Life on Earth: Past, Present and Future

Curriculum subtopic:   How is Biodiversity Threatened and How Can We Protect It?

Difficulty level:  

Worksheet Overview

Every ecosystem is bursting with life - just look at this rainforest!


Reminder: An environment is where beings live, but an ecosystem describes living things interacting with non-living things!


A rainforest


Everywhere you look, you can see communities of different species sharing habitats and relying on each other for resources to survive.


This is called biodiversity: when many different species live together in an ecosystem - this includes plants too!


The higher the biodiversity, the more types of species coexist and the more stable the ecosystem.


For an ecosystem to be healthy, it needs the following:




As the Earth is one large ecosystem, this applies to us too, meaning that human survival depends on protecting our environment so that it stays stable and extinction is avoided!


So let’s put all these pieces together:




The smallest change to one creature can affect everyone, like in a food chain, so preserving nature should be a key responsibility for humans.


The more habitat damage and the more disruption between native species there is, the more inevitable extinction becomes.


But, while environmental awareness is increasing, humans have already damaged the world in three major ways:


Human impact on the environment


Deforestation provides land for farming and housing, but fewer trees means fewer habitats and less carbon dioxide gas being absorbed from the atmosphere, destabilising the planet.


Next, increasing population is challenging biodiversity, as more people means more waste, and unfortunately, humans are not very good at managing their rubbish!


Sewage and fertilisers have polluted our water, toxic gases and smoke are causing air pollution and landfills are damaging land, along with toxic chemicals.


And the one we’re all feeling - global warming! More carbon dioxide and methane in the atmosphere is heating the planet through the greenhouse effect. The hotter the planet gets, the more biodiversity suffers - just think about the polar bears!


Polar bears


We are getting better at helping the planet, but money, the potential loss of jobs, and the need for more housing development for the growing population, are all barriers to global improvement.


So in summary:




Girl going on holiday


It is not all bad news though, as ecotourism has been successful in helping to restabilise ecosystems by minimising the effect of tourists on biodiversity.

The big bonus is that it’s sustainable, meaning it can replace resources as fast as it uses them!

Ecotourism involves reducing exploitation and strives to make any future developments useful for locals as well as tourists.


Now it's time for some questions on this topic.

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