Violent attacks are on the rise in Burkina Faso, many of them targeting government institutions and Christian communities. Ismaila Kane explains that these are driven by a weakening of the state over the last ten years which makes it easier for violent groups – like bandits, local militias and jihadists – to emerge and thrive.

The Arctic is warming at twice the rate of the rest of the planet. We've all seen the images of polar bears on small ice floes, but the results of warming go far deeper than what's visible. Graham Underwood explores the consequences of ice loss from the very bottom of the food chain, in the microbial processes that drive the biology of the ocean.