Fill in the Blanks Climate change: new wordsOnline version Students should guess the missing words in the text. by sabela carreira 1 Scientists rapidly planet's warming change climate implications human temperature What is climate ? The planet's has constantly been changing over geological time . The global average today is about 15C , though geological evidence suggests it has been much higher and lower in the past . However , the current period of is occurring more than many past events . are concerned that the natural fluctuation , or variability , is being overtaken by a rapid - induced warming that has serious for the stability of the climate .