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1. It is essential that we protect the environment and ecosystem which has been seriously damaged in some areas by unnecessary human activity.

2. Inner Mongolia has many natural deserts and such careless human activity has given them a perfect opportunity to expand - and expand they have.

3. He also agrees that the level of it is rising because of human activity and that this should warm the climate.

4. The series of IPCC reports made a big dent in the credibility of lingering skepticism about the link between human activity and global warming.

5. The Defense Intelligence Agency's human intelligence collection activity would become a separate agency, like the former CIA directorate of operations.

6. Understanding how human activity modifies the atmosphere and oceans governing our planet's weather is enormously difficult.

7. While Hanwang's old town has been sealed off since rescue work ended, there are fleeting clues of human activity.

8. It is the site of some of the earliest traces of human activity in that area.

9. China's own National Assessment Report concluded in 2005 that climate change is taking place, and that it is most likely due to human activity.

10. The latest scientific reports have shown it is happening and that human activity is responsible.