Air pollution caused by humans and resulting in high concentration of aerosols in the atmosphere affected annual monsoon rainfall in the northern hemisphere.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/monsoon-rainfall-declined-last-50-years-due-human-induced-air-pollution
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/international-business-times
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/aerosols
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/forest-fires
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biomass
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asia
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indoor-air-pollution