Of all the effects that are possible due to global warming would be climatic changes that could bring about massive floods and famines around the world. It could disrupt weather patterns, as well, meaning that places that never have snow, would now have snow, or at least VERY cold weather. Likewise for those areas that have historically been colder would become warmer. This would harm ecosystems that have come to depend on the constancy of the temperatures. It really is a snowball effect which impacts everything from the very largest systems to the smallest.
