that is pretty drawmatic. what does all this mean -- dramatic -- for living things? the icon of what it means to be an animal in the warming world the polar bear. polar bears hunt off the ice which is very rapidly disappearing. one of the points i make in the book and it isn't really my point it is a point made by the scientist i went out with. the changes of climate change are likely to be more devastating in the tropics and there are a couple reasons. one of which is the tropics are where the most animals live. if you think of trees. canada's boil forest is the largest intact forest left on the planet. it covers a billion acres and there is only about 20 species of trees you can find. here we are in a cloud forest in the andes in peru from about 12,000 feet. and some scientist here named miles silman who works at wake forest university laid out tree plots along the ridge and each plot is exactly two and a half acres. and in each plot you can get a hundred different species of trees in just two and a half acres. so five times as many species as you get in a billion