1. Charles Keeling collected data on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide kept on increasing during that time
1. Charles Keeling collected ______on the carbon dioxide content in the atmosphere over a forty-year period. He found that the amount of carbon dioxide _______ increasing during that time. data kept on
2. Although we are burning coal in huge quantities every year, we won't run out of it for centuries. 3. If the amount of greenhouse gases continues to huild up we could be facing a global catastrophe
2. Although we are burning coal in huge _________ every year, we won't ________ of it for centuries. 3. If the amount of greenhouse gases continues to _______ we could be facing a global __________ . quantities run out build up catastrophe
4. Many scientists believe that global warming has come about through the burning of fossil fuels. They do not think that ignoring the issue is worth the risk 5. Climate describes weather conditions over a period of years in a particular place
4. Many scientists believe that global warming has __________ through the burning of fossil fuels. They do not think that ignoring the issue is worth the ____ . come about risk 5. ______ describes weather conditions over a period of years in a particular place. Climate
6. The consequence of a rising sea level would be widespread flooding. 7. The use of energy in Susanna's country is low compared to the use of energy in the usa
6. The _____________ of a rising sea level would be widespread flooding. 7. The use of energy in Susanna's country is low ______________ the use of energy in the USA. consequence compared to
8. The warming of the earth is a phenomenon that causes great concern 9. The graph shows temperature changes during the 20th century. 10. One hectare of forest can absorb 23 tons of carbon dioxide per year
8. The warming of the earth is a _____________ that causes great concern. 9. The ________ shows temperature changes during the 20th century. 10. One hectare of forest can absorb 23 tons of carbon dioxide ____ year. phenomenon graph per