Question

At the moment, scientists agree that the world's climate 1) B warmer over the past 50 years, but they disagree about the causes. Some believe that human activities 2) ___ climate change. They argue that for 1,000 or 2,000 years before 1850, when records3)___, the temperature was more or less stable. Short warm or cold periods 4) ___ during that time, but the climate always5)___to the same level. However, since the Industrial Revolution, human beings 6) ___ more and more fossil fuels, such as coal and oil. In 1800 the atmosphere 7) ___ around 280 parts per million of carbon dioxide (CO2). Since then there 8) ___ an increase of about 3 l%. This extra carbon dioxide 9) ___ the world's temperature because of the greenhouse effect. Other scientists disagree that human activities over the past 50 years 10) ___ global warming. They point out that volcanoes and other natural processes 11) ___ CO2 into the atmosphere, and that human activity12) ___ a rise in CO2 of only three per cent. In 1999, 156 countries13) ___ the Kyoto protocol, part of a United Nations agreement on climate change, which14) ___ into force in 2005.They 15) ___ to reduce their emissions of CO2 and other greenhouse gases, although so far, some countries, such as the USA and Australia,16)___any action. Ответы: 1. A became B has become 2. A caused B have caused 3. A began B have begun 4. A occurred B have occurred 5. A returned B has returned 6. A burned B have burned 7. A contained B has contained 8. A was B has been 9. A raised B has raised 10. A caused B have caused 11. A always released B have always released 12. A contributed B has contributed 13. A signed B have signed 14. A came B has come 15. A agreed B have agreed 16. A did not take B have not taken

Answer 1

1b
2b
3a
4a
5a
6b
7a
8b
9b
10b
11b
12b
13a
14a
15a
16b

Answer 2

The world's climate over the past 50 years has become warmer, and scientists disagree about the causes.

Scientists agree that the world's climate has become warmer over the past 50 years, but they disagree about the causes Some believe that human activities have caused climate change They argue that for 1,000 or 2,000 years before 1850, when records began, the temperature was more or less stable Short warm or cold periods occurred during that time, but the climate always returned to the same level However, since the Industrial Revolution, human beings have burned more and more fossil fuels, such as coal and oil In 1800, the atmosphere contained around 280 parts per million of carbon dioxide (CO2), but since then, there has been an increase of about 3% This extra carbon dioxide has raised the world's temperature because of the greenhouse effect.

On the other hand, other scientists disagree that human activities over the past 50 years have caused global warming. They point out that volcanoes and other natural processes have always released CO2 into the atmosphere, and that human activity has only contributed to a rise in CO2 of three percent In 1999, 156 countries signed the Kyoto Protocol, part of a United Nations agreement on climate change, which came into force in 2005. They agreed to reduce their emissions of CO2 and other greenhouse gases, although so far, some countries, such as the USA and Australia, have not taken any action.

In summary: - The world's climate has become warmer over the past 50 years. - Some scientists believe that human activities have caused climate change, while others disagree. - Human activities, such as burning fossil fuels, have increased the concentration of carbon dioxide in the atmosphere, leading to a rise in temperature. - Natural processes, such as volcanic activity, also contribute to the release of CO2 into the atmosphere. - The Kyoto Protocol was signed by 156 countries in 1999, aiming to reduce emissions of greenhouse gases.

Please note that the information provided is based on search result snippets and should be verified with more comprehensive sources for a complete understanding of the topic.