43. _________ Since 1861, the average temperature all over the world has gone up one degree Fahrenheit. This may not seem like much, but if the trend continues, the result will be disastrous. The ice caps would melt, flooding all coastal areas and reducing the total land area of the earth by 30 percent. All climatic zones would change; farmland would turn to desert and forest into grassland. (A) Famous landmarks of the earth have changed for the last 140 years. (B) Famous landmarks on earth have not been changed until 140 years ago. (C) There is a steady increase in the temperature of the earth since 140 years ago. (D) There has been a steady increase in the temperature on earth since 140 years ago.