There is much debate about whether or not global warming exists and whether people and their actions are to blame. high levels of carbon dioxide tend to increase earth's temperature. which of these is a biased statement about carbon dioxide in the atmosphere? a) higher temperatures will cause ice sea level to rise. b) burning fossil fuels releases carbon dioxide into the atmosphere. c) humans and their activities do not affect the natural cycles of the earth. d) carbon dioxide levels naturally rise and fall in cycles over thousands of years.