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Gap filling - present perfect

Completar frases

Read the text about climate change and write the correct form of the verbs in brackets.

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second language
present perfect
9º Ensino Fundamental
 Edad recomendada: 14 años
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Ricardo Brand
Ricardo Brand
Brasil

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Gap filling - present perfect

Read the text about climate change and write the correct form of the verbs in brackets.

Ricardo Brand
1

raised contained burned taken came returned caused has agreed have signed have been occurred contributed began released has caused has have has have become haven't

At the moment , scientists agree that the world's climate warmer over the past 50 years , but they disagree about the causes . Some believe that human activities ( cause ) climate change . They argue that for 1 . 000 or 2 . 000 years before 1850 , when records ( begin ) , the temperature was more or less stable . Short warm or cold periods ( occur ) during that time , but the climate alsways ( return ) to the same level . However , since the Industrial Revolution , human beings ( burn ) more and more fossil fuels , such as coal and oil . In 1800 the atmosphere ( contain ) around 280 parts per million of carbon dioxide ( CO2 ) . Since then there ( be ) an increase of about 31% . This extra carbon dioxide ( raise ) the world's temperature because of the greenhouse effect .
Other scientists disagree that human activities over the past years ( cause ) global warming . They point out that volcanoes and other natural processes always ( release ) CO2 into the atmsphere , and that human activity ( contribute ) a rise in CO2 of only three per cent .
In 1999 , 156 countries ( sign ) the Kyoto protocol , part of a United Nations agreement on climate change , which ( come ) into force in 2005 . They ( agree ) to reduce their emissions of CO2 and other greenhouse gases , although so far , some countries , such as the USA and Australia , ( take ) any action .

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