The Week in Pictures: Scotland To Get All Electricity From Renewable Energy, 20% of World's Plant Species Threatened With Extinction, and More (Slideshow)

On the renewable energy front, it's been good news this week: Northern Ireland just outlined how it hopes to get 40% of its electricity from renewable sources by 2020 and, not to be outdone, First Minister of Scotland Alex Salmond, speaking to Reuters, said Scotland should be able to produce 100% of its electricity from low-carbon sources by 2025. On the flip-side, a new global analysis revealed that one in five of the world's plant species are threatened with extinction.

In other fascinating news, French researchers have created a fuel cell powered by rat blood that is more powerful and smaller than current pacemaker batteries; Tigers have been successfully reintroduced into India's Sariska Tiger Reserve, and former President Bill Clinton, reputed for his legendary consumption of snack foods, has made a surprise move: he gave up meat and dairy products, becoming a vegan. Find out what else happened this week in our selection of the top stories from the world of green: