Week of April 10, 2017 – Antimony Antimony – during remediation and environmental investigations, it is one of those meta
Trends in atmospheric concentrations of CO2 (ppm), CH4 (ppb) and N2O (ppb), between 1800 and 2017 — European Environment Agency
![Leto Atreides on Twitter: "i only pretend to understand what parts per million (ppm) means. parts per million WHAT?" / Twitter Leto Atreides on Twitter: "i only pretend to understand what parts per million (ppm) means. parts per million WHAT?" / Twitter](https://pbs.twimg.com/media/Efp04xOXYAAs3BC.jpg)