This is a vague graph, and I question how it was made (not every piece of information that comes out of a textbook is a gold bar of truth). These problems are more connected than this bar graph indicates. But it makes you consider some less-emphasized, important factors of biodiversity. And most of these problems are exacerbated by human activities.
Habitat loss and fragmentation are a huge problem. Animals (and plants) need migratory pathways, not to mention space to live in.
These migratory pathways are essential as species have to adapt to Climate Change and greenhouse gases trap radiation in the atmosphere.
With food production we deposit huge amounts of Nitrogen into the ecosystem, and burning fossil fuels puts a lot of CO2 into the atmosphere.
Invasive species (created by biotic exchange) reduce local biodiversity, and result from careless acts as well as purposeful decisions.
(from Ecology of Plants 2nd edition 2006)