1. ____ the gases from industrialisation that have caused the greenhouse effect. 2. What scientists ____ is analyse air that’s 800,000 years old, trapped under the ice in Antarctica. 3. Never ____ there been more carbon dioxide in the atmosphere than there is now. 4. ____ happened was that average temperatures rose by one degree Celsius last century. 5. Not only ____ we observing a rise in sea levels, but also many more extreme weather events. 6. If we don’t act now, ____ we’re doing is creating problems for future generations.

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