As the investigation begins into the cause of the mid-air crash between an American Airlines regional passenger jet and a U.S. army Black Hawk helicopter, questions have been raised about the role played by the Traffic Alert and Collision Avoidance System.

In this week’s issue of our environmental newsletter, we find out how much longer you could live (and the emissions you could cut) if you swap out some read meat for plant-based proteins. We also explore how fracking causes earthquakes and see the greenery on Singapore’s buildings that’s attracting nature.