Ahead of World Water Day Monday, the World Meteorological Organization warns climate change is intensifying water-related disasters, threatening the lives and livelihoods of billions of people worldwide.   Climate-related hazards include increased flooding and longer-lasting droughts. Climate change also is altering rainfall patterns, affecting water availability and worsening the damage floods and drought cause worldwide.   The WMO says increased flooding threatens to destroy water points and sanitation facilities and contaminate water sources. As a consequence, WMO spokeswoman Clare Nullis says billions of people have limited or no access to …