Paris (AFP) - Medical experts say climate change affects human health in direct ways, by the spread of water- and mosquito-borne diseases for example, and indirectly, such as through hunger.Here is a snapshot of the problem:- Thousands more dead -Between 2030 and 2050, climate change could result in nearly 250,000 deaths per year -- an estimated 38,000 from high temperatures, 48,000 deaths from diarrhoea, 60,000 from malaria and 95,000 from malnutrition, according to the World Health Organization (WHO). By 2030, the direct damage costs to health will be a whopping two to four billion US dollars (1.9 to 3.8 billion euros) per year, according to the WHO.- Cause and effect -Patrice Halimi, the secretary general of France's environmental health association, said it is a multi-faceted issue. "Like any other slow-onset disaster, there is not one cause that leads to one effect," he said.