What are the threats to biodiversity and ecosystem?

Scientists have warned of an alarming increase in the extinction of animal species because of the threats to biodiversity and ecosystems posed by pollution, climate change and the spread of cities.The Diversites Group, rather, of global experts on biodiversity said it’s appeared increasingly likely that reduction targets set by the world leaders for 2010 would not be met. Dozens of environmental protesters are on the roof of the Houses of Parliament in London after climbing up and unfurling banners calling for action to prevent climate change. The spokeswoman for the environmental pressure group Greenpeace said the action was timed to coincide with the return of members of parliament after the summer recess. (2) Greenpeace has said at least 20 people would remain overnight and throughout Monday.