Environment links

Where does methane or 'natural gas' come from? Is it a greenhouse gas? How much methane do cows produce? All these questions answered, visually.
The Kessler syndrome (also called the Kessler effect,[1][2] collisional cascading, or ablation cascade), proposed by the NASA scientist Donald J. Kessler in 1978, is a scenario in which the density of objects in low Earth orbit (LEO) is high enough that collisions between objects could cause a cascade in which each collision generates space debris that increases the likelihood of further collisions.[3] One implication is that the distribution of debris in orbit could render space activities and the use of satellites in specific orbital ranges difficult for many generations.[3]
Stuff in Space is a realtime 3D map of objects in Earth orbit, visualized using WebGL.