evidence: - Proximal cause: The deaths will be caused only indirectly by AGW. More direct causes of death will include heat and humidity, rising sea levels, freak storms, changing precipitation patterns, disappearing glaciers affecting water supplies, ocean acidification, more frequent bushfires, loss of biodiversity, and so on. Many of these side-effects of AGW will reduce food supplies, causing famines. [...] - The estimate corresponds to 10% of the projected future world population. All 10 billion humans will need food and fresh water to survive, and AGW will seriously affect both.