You will listen to a researcher talking about the increase of the acidity level in oceans. 

It is a ted talk about changes in the oceans, which are caused by the increase of CO2 absorption. Students will check their listening skills and work on specific vocabulary, including how to describe figures in a chart. 

How Pollution Is Changing the Chemistry of The Ocean

how-pollution-is-changing-the-chemistry-of-the-ocean

Let's do English ESL deep listening: focus on meaning. You will listen to a researcher talking about the increase of the acidity level in oceans. 