
http://www.radio-canada.ca/regions/ontario/2013/08/29/017-algues-erie-lac.shtml
Here’s a Wordle created with the above website about pollution with algae.
Just by looking at the big words, we can guess that the problem with algae in a lake seems to be caused by the amount of phosphorus in the water.
The Environment Canada Ministry provides a different angle on the topic.
http://www.ec.gc.ca/grandslacs-greatlakes/default.asp?lang=Fr&n=6201FD24-1

The sources of phosphorus agriculture, fertilizer, industries, human waste, decomposing “stuff”.
There is a solution to this problem as described in the following Radio-Canada link:
http://www.radio-canada.ca/nouvelles/science/2011/06/30/001-algues-carburant-recherche.shtml

The algae can be transformed into something useful: bio-fuel. The following TED talk discusses how. Although the video is in English, there is a French translation to the video.

Many of the articles are too difficult for grade 3 and grade 4 students studying plants and habitats; however, doing a Wordle project allow the students to search the Internet and still see or guess what are the important ideas of the articles they found. After going to class, analyzing the words and making connections and inferences as a group can allow students to understand what is happening, with a class discussion followed by games and experiments.