Global warming, fragmentation of habitat, and invasion of alien species are all threats to the biodiversity of a geographical area.

Global warming increases the overall temperature of the atmosphere, which can lead to the extinction of certain species that cannot adapt to the change in temperature.

Fragmentation of habitat refers to the division of large habitats into smaller ones. This can lead to a decrease in biodiversity as smaller, isolated habitats may not be able to support as many different species as a larger, connected habitat.

Invasion of alien species can also threaten biodiversity. When a new species is introduced to a habitat, it can outcompete native species for resources, leading to a decrease in biodiversity.

Promotion of vegetarianism, on the other hand, is not a threat to biodiversity. In fact, it can be argued that it helps biodiversity by reducing the demand for meat, which can lead to less habitat destruction for livestock farming.