In the Argentine city of San Nicolas de los Arroyos, which hugs the banks of the Parana River, two huge murals reflect local worries about a growing environmental issue for the region - the declining levels of the waterway.
The two 40m-high (130-ft) paintings on the sides of buildings in the city center were spurred by the artist's desire to stir debate over the river's decline. Hit by a lack of rainfall upriver in Brazil, this year the Parana reached its lowest level in almost 80 years.
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