Pennsylvania Junior Envirothon Practice Test 2026 – Complete Exam Prep

Human activities can negatively impact biodiversity primarily through habitat destruction and pollution. Habitat destruction occurs when natural environments are altered or obliterated to make way for urban development, agriculture, or infrastructure projects. This leads to the loss of ecosystems that are vital for various species, diminishing their habitats and reducing their ability to thrive.

Pollution plays a significant role as well, as it contaminates air, water, and soil, affecting all forms of life. Chemical pollutants can disrupt reproductive processes, poison wildlife, and introduce toxins into food chains, ultimately leading to declines in population sizes or even extinction for some species. The combination of habitat destruction and pollution creates a dual threat to biodiversity, endangering the delicate balance of ecosystems that supports diverse species.

In contrast, activities such as planting more trees, constructing green spaces, or promoting sustainable agriculture can have positive impacts on biodiversity, as they often aim to restore habitats or maintain ecological balance rather than disrupt it. These practices can enhance local ecosystems, promote wildlife habitat restoration, and mitigate some of the adverse effects caused by human activities.