The use of too much fertilizers, creates algae and seaweed which produce toxic
gases that can kill animals within minutes:
http://www.guardian.co.uk/environment/2011/jul/27/brittany-beaches-toxic-algae-boars
http://www.dailymail.co.uk/sciencetech/article-1207817/Coastal-wildlife-threatened-vast-seaweed-blooms-caused-hot-rainy-weather.html
NOO! the horror!