The problem had hit Britain now because we were feeding the algae with phosphates and nitrates and causing blooms.

Agriculture can also introduce fertilizers and pesticides, causing algal blooms and reduced water quality.

An excessive amount of nutrients from fertilizers and animal waste has caused algal blooms and eutrophication.

By the 1960s and 1970s, the increased pollution caused frequent algal blooms to occur in the summer.

In particular, the annual flooding brought silt, which caused blooms of algae to develop which in turn supported a rich fishery.

It thrives at 20 C and can cause blooms in the summer and early autumn.

The plasma cannons and lasers caused huge thermal blooms each time they fired and the signature was distinctive against the cold night background.

Surface runoff from farms and lawns threatens to carry in excessive nutrients that can cause algal blooms.

The ultimate cause of hypoxia is excess nutrient loading from human activities causing algal blooms.

This nutrient enrichment has caused several algal blooms in recent years.