The Amsterdam company Respyre has developed concrete and plaster that support the growth of moss. These materials can be used for new construction, as well as on existing buildings. The moss then acts as a respiration system for the city. It takes in water and CO2 from the air and releases oxygen.
Moss has other benefits, too. Watch this short video to find out more.
Respyre empowers cities to breathe from design united on Vimeo.
The video is 1:24 minutes long, so it's easy to watch during a lesson.
Re: Discussion question #2
The speaker is Dutch, so the accent can be challenging for lower-level students. This is an opportunity to talk about the nature of international English: it doesn't matter if you have a Dutch (or any other accent), as long as you can be understood. Forget trying to sound "native"—there is no such thing!
If this topic is lively, you can continue it with "English Language Statistics – an Exhaustive List", from Lemon Grad. It's an easy read with interesting stats.