The answer is: They cut down trees for heating & building
Until today, the chinese government hasn't developed a sustainable plan to address the issue that arise from over exploitation of the environment.
Because of this, people and corporations in china often conduct unsafe measures when they cut down trees. They do not have to pay attention to the regeneration of the forest. Because of this, forestland has declined in eastern China.
The correct answer is this - <span>this research would not require IRB review because it would be eligible for exemption since the researcher is not interacting with the children and the playground is a public setting.
If the conditions were a little bit different, then his IRB review would also require different results. However, since there is no real interaction with the children, but rather only observation, an IRB review is not necessary in this case and can be avoided.
</span>
Answer:
The surface area of the Earth is 510 million square kilometers