Scientists have found that plastic trash - ubiquitous throughout the world's oceans - massively increases the chance of disease in corals.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/plastic-trash-linked-disease-corals-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/plastics
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/corals
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-ecosystems
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/marine-life
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diseases
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmental-health
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment