Biodiversity hotspot: These are regions with exceptionally high levels of biodiversity that are threatened due to human activities.
Keystone species:These are species that have a disproportionately large impact on their ecosystem relative to their abundance. Their removal can cause significant changes in the structure and function of the ecosystem.
Ecological footprint: It is a measure of human demand on Earth's ecosystems, representing the amount of land and resources required to sustainably support a population.